1. The document discusses AC circuits and components including inductors, capacitors, resistors, and transformers.
2. Key concepts covered include inductive and capacitive reactance, impedance, phase relationships between voltage and current, and calculations of effective voltage and current.
3. Transformers can be used to step up or down voltages in an AC circuit by changing the ratio of turns in the primary and secondary coils. An ideal transformer does not lose energy.
1) Effective current in an AC circuit is 0.707 times the maximum current. Effective voltage is 0.707 times the maximum voltage.
2) Inductive reactance is directly proportional to frequency and inductance. Capacitive reactance is inversely proportional to frequency and capacitance.
3) Impedance is the total opposition to current flow in an AC circuit consisting of resistance and reactance. Power is consumed only by the resistive component of impedance and is proportional to the cosine of the phase angle.
An AC circuit containing resistance, inductance, and capacitance is described. Voltage and current in an inductor are 90 degrees out of phase, with voltage leading current. In a capacitor, voltage lags current by 90 degrees. Reactance is the opposition to AC current flow presented by inductors and capacitors. Inductive reactance increases with frequency, while capacitive reactance decreases with frequency. In a series RLC circuit, the voltages across each component have distinct phase relationships to the current.
The document defines key concepts in AC circuits including:
- Effective current and voltage as 0.707 times peak values
- Inductive and capacitive reactance defined as functions of inductance/capacitance and frequency
- Impedance in an AC circuit calculated as the vector sum of resistance and reactance
- Resonant frequency occurs when inductive and capacitive reactance values are equal
- Power in an AC circuit depends on the resistance component and is calculated using current, voltage, and power factor
This document provides an overview of alternating current (AC) circuits. It defines key concepts like effective current and voltage, and describes the phase relationships between voltage and current in circuits containing resistance, capacitance, and inductance. Equations are given for calculating inductive and capacitive reactance. Transformers are also briefly discussed. The objectives are to understand and apply equations for various AC circuit parameters like impedance and resonant frequency.
This document discusses AC circuits and their components. It covers:
- Calculating inductive and capacitive reactance for inductors and capacitors.
- Phase relationships in circuits with resistance, capacitance, and inductance. Voltage leads or lags current depending on the component.
- Impedance, effective current, power, and resonant frequency calculations for series RLC circuits. Resonance occurs when inductive and capacitive reactances cancel out.
- An AC current varies sinusoidally with time and has no overall direction like DC. Its magnitude oscillates according to E=Emaxsin(ωt) and i=imaxsin(ωt), where Emax and imax are the maximum values.
- The average AC current over a full cycle is zero, but power is still expended. The root-mean-square (rms) value of the current, which is 0.707 times the maximum, is used to represent the effective current.
- In a pure resistance, the voltage and current are in phase and obey Ohm's law using the effective voltages and currents. In a pure inductor, the voltage peaks before the current and
Alternating current (AC), is an electric current in which the flow of electric charge periodically reverses direction, whereas in direct current (DC, also dc), the flow of electric charge is only in one direction.
Electrical Engineering is the Branch of Engineering. Electrical Engineering field requires an understanding of core areas including Thermal and Hydraulics Prime Movers, Analog Electronic Circuits, Network Analysis and Synthesis, DC Machines and Transformers, Digital Electronic Circuits, Fundamentals of Power Electronics, Control System Engineering, Engineering Electromagnetics, Microprocessor and Microcontroller. Ekeeda offers Online Mechanical Engineering Courses for all the Subjects as per the Syllabus Visit : https://ekeeda.com/streamdetails/stream/Electrical-Engineering
1) Effective current in an AC circuit is 0.707 times the maximum current. Effective voltage is 0.707 times the maximum voltage.
2) Inductive reactance is directly proportional to frequency and inductance. Capacitive reactance is inversely proportional to frequency and capacitance.
3) Impedance is the total opposition to current flow in an AC circuit consisting of resistance and reactance. Power is consumed only by the resistive component of impedance and is proportional to the cosine of the phase angle.
An AC circuit containing resistance, inductance, and capacitance is described. Voltage and current in an inductor are 90 degrees out of phase, with voltage leading current. In a capacitor, voltage lags current by 90 degrees. Reactance is the opposition to AC current flow presented by inductors and capacitors. Inductive reactance increases with frequency, while capacitive reactance decreases with frequency. In a series RLC circuit, the voltages across each component have distinct phase relationships to the current.
The document defines key concepts in AC circuits including:
- Effective current and voltage as 0.707 times peak values
- Inductive and capacitive reactance defined as functions of inductance/capacitance and frequency
- Impedance in an AC circuit calculated as the vector sum of resistance and reactance
- Resonant frequency occurs when inductive and capacitive reactance values are equal
- Power in an AC circuit depends on the resistance component and is calculated using current, voltage, and power factor
This document provides an overview of alternating current (AC) circuits. It defines key concepts like effective current and voltage, and describes the phase relationships between voltage and current in circuits containing resistance, capacitance, and inductance. Equations are given for calculating inductive and capacitive reactance. Transformers are also briefly discussed. The objectives are to understand and apply equations for various AC circuit parameters like impedance and resonant frequency.
This document discusses AC circuits and their components. It covers:
- Calculating inductive and capacitive reactance for inductors and capacitors.
- Phase relationships in circuits with resistance, capacitance, and inductance. Voltage leads or lags current depending on the component.
- Impedance, effective current, power, and resonant frequency calculations for series RLC circuits. Resonance occurs when inductive and capacitive reactances cancel out.
- An AC current varies sinusoidally with time and has no overall direction like DC. Its magnitude oscillates according to E=Emaxsin(ωt) and i=imaxsin(ωt), where Emax and imax are the maximum values.
- The average AC current over a full cycle is zero, but power is still expended. The root-mean-square (rms) value of the current, which is 0.707 times the maximum, is used to represent the effective current.
- In a pure resistance, the voltage and current are in phase and obey Ohm's law using the effective voltages and currents. In a pure inductor, the voltage peaks before the current and
Alternating current (AC), is an electric current in which the flow of electric charge periodically reverses direction, whereas in direct current (DC, also dc), the flow of electric charge is only in one direction.
Electrical Engineering is the Branch of Engineering. Electrical Engineering field requires an understanding of core areas including Thermal and Hydraulics Prime Movers, Analog Electronic Circuits, Network Analysis and Synthesis, DC Machines and Transformers, Digital Electronic Circuits, Fundamentals of Power Electronics, Control System Engineering, Engineering Electromagnetics, Microprocessor and Microcontroller. Ekeeda offers Online Mechanical Engineering Courses for all the Subjects as per the Syllabus Visit : https://ekeeda.com/streamdetails/stream/Electrical-Engineering
EE Study Notes provides information on various electrical engineering concepts:
1. Ohm's Law defines the relationship between voltage, current, and resistance in a circuit. Resistors in series have a total voltage equal to the sum of individual voltages and a single current. Resistors in parallel have the same voltage but total current equals the sum of individual currents.
2. Capacitors store energy in the form of electric charge, with capacitance determining how much charge is stored for a given voltage. Capacitors combine in series and parallel like resistors.
3. AC circuits have voltage and current that vary sinusoidally over time. Phase relationships describe whether voltage and current are in phase, or if
AC circuits usually contain inductance or capacitance which cause reactance. Reactance is resistance to current flow due to these components and is measured in ohms. There are two types of reactance - inductive reactance XL and capacitive reactance XC. Phasor diagrams can represent alternating quantities, with the phase angle between voltage and current indicating whether a circuit is resistive, capacitive, or inductive.
1. The document discusses direct current (DC) and alternating current (AC). DC flows in one direction while AC periodically reverses direction.
2. Simple AC circuits containing a resistor, capacitor, or inductor are examined. A resistor allows both DC and AC. A capacitor blocks DC but allows AC, while an inductor opposes rapid changes in current.
3. Impedance, phase factor, and resonance effects are also covered. Impedance represents the total opposition to current flow. Resonance occurs at the frequency where capacitive and inductive reactances cancel out, producing a maximum current.
The document provides an overview of key topics in alternating current (AC) circuits covered in Chapter 31, including:
1) The use of phasors to describe sinusoidally varying quantities in AC circuits such as resistors, inductors, and capacitors.
2) Analyzing RLC series circuits driven by a sinusoidal voltage source using phasors.
3) Factors that determine the power in an AC circuit such as the current and voltage amplitudes and their phase relationship.
4) Resonance in RLC circuits and the effect of frequency on current.
5) Transformers and how they can change AC voltages and currents through electromagnetic induction.
A capacitor in an AC circuit leads the voltage by 90 degrees. As frequency increases, capacitive reactance decreases and maximum current increases. For a 2-μF capacitor connected to a 120-V, 60-Hz source, the effective current is 90.5 mA and peak current is 128 mA.
This document summarizes key concepts about alternating current (AC) circuits including resistors, inductors, and capacitors in AC circuits. It discusses the RLC series circuit, power in AC circuits, and resonance. It also covers transformers and how they are used for power transmission by stepping voltages up or down. Resonance occurs at the resonance frequency when the inductive reactance equals the capacitive reactance in a RLC series circuit, resulting in maximum current. Transformers use magnetic induction to change AC voltages efficiently for applications like power distribution.
This document discusses alternating current (AC) circuits and analysis. It begins by introducing AC circuits driven by sinusoidal sources as opposed to direct current (DC) circuits. Sinusoids and phasors are then defined as tools for analyzing AC circuits. Common circuit elements like resistors, inductors, and capacitors are examined in the phasor domain. Methods for determining voltage, current, impedance, power, and other characteristics of AC circuits are presented through examples and exercises. Key aspects of sinusoidal steady-state analysis of AC circuits are covered.
This document provides a summary of a seminar presentation on analyzing single phase AC circuits. The presentation covered various circuit elements in AC circuits including resistors, inductors, and capacitors in both series and parallel configurations. It discussed the concepts of impedance, phase relationships between voltage and current, and resonance. Resonance occurs when the inductive and capacitive reactances are equal, resulting in maximum current flow. The key topics were analyzing purely resistive, inductive, and capacitive circuits, and combinations using circuit laws and phasor diagrams.
- Alternating current changes direction periodically in a sine wave pattern. The frequency is measured in Hertz (Hz), typically 50 or 60 Hz.
- AC can transmit power over longer distances with less power loss than direct current. AC voltages can be increased or decreased using transformers.
- Important AC terms include root mean square (RMS) value, phase angle, impedance, and resonance. Resonance occurs when the capacitive and inductive reactances cancel out, resulting in maximum current. Circuits can resonate in series or parallel configurations.
This chapter discusses a.c. circuits containing resistors, inductors, and capacitors connected in series. It introduces the concepts of reactance and impedance to analyze simple a.c. series circuits. The key learning outcomes are to understand phasor and waveform diagrams for resistance, inductance, and capacitance, and analyze circuits using impedance and power triangles. The chapter also covers power dissipation calculations and introduces the concept of series resonance.
1) Charge is the electrical property of atomic particles that composes matter. It can be negative or positive and is measured in coulombs.
2) Current is the flow of charge or electrons through a conducting material. It is measured in amperes.
3) Alternating current periodically changes its magnitude and direction, unlike direct current which flows in only one direction. It is the type of electric current used in power grids and appliances.
Chameli Devi Group of Institution(BEE) (2).pptx10croreviews
The document discusses series resistor-inductor-capacitor (RLC) circuits, describing how an RLC circuit consists of a resistor, inductor, and capacitor connected in series across an alternating voltage supply. It explains that in an RLC circuit, the voltage drops across each component are out of phase with each other and with the current. The document also covers concepts such as impedance, phasor diagrams, resonance, frequency response, time domain response, and applications of series RLC circuits.
Alternating current (AC), is an electric current in which the flow of electric charge periodically reverses direction, whereas in direct current (DC, also dc), the flow of electric charge is only in one direction.
Any periodic variation of current or voltage where the current (or voltage), when measured along
any particular direction goes positive as well as negative, is defined to be an AC quantity.
Sinusoidal AC wave shapes are the ones where the variation (current or voltage) is a sine function
of time.
1) An AC circuit uses a power source that provides alternating current where the voltage varies sinusoidally over time.
2) In a purely resistive AC circuit, the current and voltage are in phase and their instantaneous values are proportional based on Ohm's law.
3) Capacitors and inductors introduce phase shifts in AC circuits - the current through a capacitor lags 90 degrees behind the voltage, while the current through an inductor leads the voltage by 90 degrees.
This document describes an experiment involving measuring voltages and currents in various AC circuits containing resistors, capacitors, and inductors. Key points:
1) An LC circuit is used to measure the resonant frequency and calculate the inductance. Current and voltage relationships are examined for resistive, capacitive, and inductive circuits individually.
2) Current and voltage measurements are taken for an LRC circuit as the frequency is varied to observe the resonance curve. Peak current frequency agrees with theoretical LC resonance frequency.
3) Voltage sensors are added to an LRC circuit to measure voltages across each component and verify Kirchhoff's loop rule and theoretical phase relationships.
This document discusses electrical circuits containing resistance, inductance and capacitance when connected to an alternating current (AC) supply. It introduces key concepts such as root mean square (RMS) voltage and current, phase relationships between voltage and current, and impedance for circuits including a single component or combinations. Specific topics covered include the behavior of resistance, inductance and capacitance when connected to an AC supply individually, and the calculations needed to analyze their effects in series and parallel circuits under AC conditions.
Electrical Engineering is the Branch of Engineering. Electrical Engineering field requires an understanding of core areas including Thermal and Hydraulics Prime Movers, Analog Electronic Circuits, Network Analysis and Synthesis, DC Machines and Transformers, Digital Electronic Circuits, Fundamentals of Power Electronics, Control System Engineering, Engineering Electromagnetics, Microprocessor and Microcontroller. Ekeeda offers Online Mechanical Engineering Courses for all the Subjects as per the Syllabus. Visit : https://ekeeda.com/streamdetails/stream/Electrical-and-Electronics-Engineering
This document provides an overview of satellite communication principles and the evolution of communication satellites. It discusses how Arthur C. Clarke first conceived of the idea of communication satellites in geostationary orbits in 1945. It then summarizes the key milestones in the development of communication satellites, including early satellites launched by the US and USSR in the late 1950s, the establishment of international cooperation organizations like INTELSAT and Comsat in the 1960s, and the growth of satellite capabilities over time. The document also provides details about Bangladesh's first communication satellite, Bangabandhu Satellite-1, and describes different types of communication satellites.
This document introduces alternating current (AC), which regularly changes direction unlike direct current (DC). It defines key terms used to describe AC quantities like amplitude, time period, frequency, instantaneous value, and angular frequency. It also provides an example problem calculating the maximum value, frequency, time period, and instantaneous value of a given sinusoidal current. Finally, it discusses average value and instantaneous and average power of AC circuits.
EE Study Notes provides information on various electrical engineering concepts:
1. Ohm's Law defines the relationship between voltage, current, and resistance in a circuit. Resistors in series have a total voltage equal to the sum of individual voltages and a single current. Resistors in parallel have the same voltage but total current equals the sum of individual currents.
2. Capacitors store energy in the form of electric charge, with capacitance determining how much charge is stored for a given voltage. Capacitors combine in series and parallel like resistors.
3. AC circuits have voltage and current that vary sinusoidally over time. Phase relationships describe whether voltage and current are in phase, or if
AC circuits usually contain inductance or capacitance which cause reactance. Reactance is resistance to current flow due to these components and is measured in ohms. There are two types of reactance - inductive reactance XL and capacitive reactance XC. Phasor diagrams can represent alternating quantities, with the phase angle between voltage and current indicating whether a circuit is resistive, capacitive, or inductive.
1. The document discusses direct current (DC) and alternating current (AC). DC flows in one direction while AC periodically reverses direction.
2. Simple AC circuits containing a resistor, capacitor, or inductor are examined. A resistor allows both DC and AC. A capacitor blocks DC but allows AC, while an inductor opposes rapid changes in current.
3. Impedance, phase factor, and resonance effects are also covered. Impedance represents the total opposition to current flow. Resonance occurs at the frequency where capacitive and inductive reactances cancel out, producing a maximum current.
The document provides an overview of key topics in alternating current (AC) circuits covered in Chapter 31, including:
1) The use of phasors to describe sinusoidally varying quantities in AC circuits such as resistors, inductors, and capacitors.
2) Analyzing RLC series circuits driven by a sinusoidal voltage source using phasors.
3) Factors that determine the power in an AC circuit such as the current and voltage amplitudes and their phase relationship.
4) Resonance in RLC circuits and the effect of frequency on current.
5) Transformers and how they can change AC voltages and currents through electromagnetic induction.
A capacitor in an AC circuit leads the voltage by 90 degrees. As frequency increases, capacitive reactance decreases and maximum current increases. For a 2-μF capacitor connected to a 120-V, 60-Hz source, the effective current is 90.5 mA and peak current is 128 mA.
This document summarizes key concepts about alternating current (AC) circuits including resistors, inductors, and capacitors in AC circuits. It discusses the RLC series circuit, power in AC circuits, and resonance. It also covers transformers and how they are used for power transmission by stepping voltages up or down. Resonance occurs at the resonance frequency when the inductive reactance equals the capacitive reactance in a RLC series circuit, resulting in maximum current. Transformers use magnetic induction to change AC voltages efficiently for applications like power distribution.
This document discusses alternating current (AC) circuits and analysis. It begins by introducing AC circuits driven by sinusoidal sources as opposed to direct current (DC) circuits. Sinusoids and phasors are then defined as tools for analyzing AC circuits. Common circuit elements like resistors, inductors, and capacitors are examined in the phasor domain. Methods for determining voltage, current, impedance, power, and other characteristics of AC circuits are presented through examples and exercises. Key aspects of sinusoidal steady-state analysis of AC circuits are covered.
This document provides a summary of a seminar presentation on analyzing single phase AC circuits. The presentation covered various circuit elements in AC circuits including resistors, inductors, and capacitors in both series and parallel configurations. It discussed the concepts of impedance, phase relationships between voltage and current, and resonance. Resonance occurs when the inductive and capacitive reactances are equal, resulting in maximum current flow. The key topics were analyzing purely resistive, inductive, and capacitive circuits, and combinations using circuit laws and phasor diagrams.
- Alternating current changes direction periodically in a sine wave pattern. The frequency is measured in Hertz (Hz), typically 50 or 60 Hz.
- AC can transmit power over longer distances with less power loss than direct current. AC voltages can be increased or decreased using transformers.
- Important AC terms include root mean square (RMS) value, phase angle, impedance, and resonance. Resonance occurs when the capacitive and inductive reactances cancel out, resulting in maximum current. Circuits can resonate in series or parallel configurations.
This chapter discusses a.c. circuits containing resistors, inductors, and capacitors connected in series. It introduces the concepts of reactance and impedance to analyze simple a.c. series circuits. The key learning outcomes are to understand phasor and waveform diagrams for resistance, inductance, and capacitance, and analyze circuits using impedance and power triangles. The chapter also covers power dissipation calculations and introduces the concept of series resonance.
1) Charge is the electrical property of atomic particles that composes matter. It can be negative or positive and is measured in coulombs.
2) Current is the flow of charge or electrons through a conducting material. It is measured in amperes.
3) Alternating current periodically changes its magnitude and direction, unlike direct current which flows in only one direction. It is the type of electric current used in power grids and appliances.
Chameli Devi Group of Institution(BEE) (2).pptx10croreviews
The document discusses series resistor-inductor-capacitor (RLC) circuits, describing how an RLC circuit consists of a resistor, inductor, and capacitor connected in series across an alternating voltage supply. It explains that in an RLC circuit, the voltage drops across each component are out of phase with each other and with the current. The document also covers concepts such as impedance, phasor diagrams, resonance, frequency response, time domain response, and applications of series RLC circuits.
Alternating current (AC), is an electric current in which the flow of electric charge periodically reverses direction, whereas in direct current (DC, also dc), the flow of electric charge is only in one direction.
Any periodic variation of current or voltage where the current (or voltage), when measured along
any particular direction goes positive as well as negative, is defined to be an AC quantity.
Sinusoidal AC wave shapes are the ones where the variation (current or voltage) is a sine function
of time.
1) An AC circuit uses a power source that provides alternating current where the voltage varies sinusoidally over time.
2) In a purely resistive AC circuit, the current and voltage are in phase and their instantaneous values are proportional based on Ohm's law.
3) Capacitors and inductors introduce phase shifts in AC circuits - the current through a capacitor lags 90 degrees behind the voltage, while the current through an inductor leads the voltage by 90 degrees.
This document describes an experiment involving measuring voltages and currents in various AC circuits containing resistors, capacitors, and inductors. Key points:
1) An LC circuit is used to measure the resonant frequency and calculate the inductance. Current and voltage relationships are examined for resistive, capacitive, and inductive circuits individually.
2) Current and voltage measurements are taken for an LRC circuit as the frequency is varied to observe the resonance curve. Peak current frequency agrees with theoretical LC resonance frequency.
3) Voltage sensors are added to an LRC circuit to measure voltages across each component and verify Kirchhoff's loop rule and theoretical phase relationships.
This document discusses electrical circuits containing resistance, inductance and capacitance when connected to an alternating current (AC) supply. It introduces key concepts such as root mean square (RMS) voltage and current, phase relationships between voltage and current, and impedance for circuits including a single component or combinations. Specific topics covered include the behavior of resistance, inductance and capacitance when connected to an AC supply individually, and the calculations needed to analyze their effects in series and parallel circuits under AC conditions.
Electrical Engineering is the Branch of Engineering. Electrical Engineering field requires an understanding of core areas including Thermal and Hydraulics Prime Movers, Analog Electronic Circuits, Network Analysis and Synthesis, DC Machines and Transformers, Digital Electronic Circuits, Fundamentals of Power Electronics, Control System Engineering, Engineering Electromagnetics, Microprocessor and Microcontroller. Ekeeda offers Online Mechanical Engineering Courses for all the Subjects as per the Syllabus. Visit : https://ekeeda.com/streamdetails/stream/Electrical-and-Electronics-Engineering
This document provides an overview of satellite communication principles and the evolution of communication satellites. It discusses how Arthur C. Clarke first conceived of the idea of communication satellites in geostationary orbits in 1945. It then summarizes the key milestones in the development of communication satellites, including early satellites launched by the US and USSR in the late 1950s, the establishment of international cooperation organizations like INTELSAT and Comsat in the 1960s, and the growth of satellite capabilities over time. The document also provides details about Bangladesh's first communication satellite, Bangabandhu Satellite-1, and describes different types of communication satellites.
This document introduces alternating current (AC), which regularly changes direction unlike direct current (DC). It defines key terms used to describe AC quantities like amplitude, time period, frequency, instantaneous value, and angular frequency. It also provides an example problem calculating the maximum value, frequency, time period, and instantaneous value of a given sinusoidal current. Finally, it discusses average value and instantaneous and average power of AC circuits.
1. The document provides a syllabus for RMS and average values, steady state analysis of RLC circuits with sinusoidal excitation, self and mutual inductances, and resonance in series and parallel circuits.
2. Key concepts covered include RMS and average values, form factors, steady state analysis using phasors, self and mutual inductances, dot convention, bandwidth and Q factor.
3. Example calculations are provided for average value, RMS value, form factor, and peak factor of different waveforms.
1) Binary codes represent numbers, letters, and other data using groups of bits or symbols. Weighted binary codes follow a positional weighting principle where each bit position represents a specific weight.
2) Non-weighted codes like excess-3 code and Gray code do not assign positional weights. Gray code is used in shaft position encoders to prevent multiple bit changes that can cause problems.
3) BCD (binary coded decimal) represents each decimal digit with a 4-bit binary number, allowing representation of numbers from 0-9. BCD addition can result in numbers outside the valid 0-9 range, requiring carries between digits.
The document discusses different number systems and digital coding techniques. It describes the decimal, binary, octal and hexadecimal number systems. Conversion methods between these systems are provided, including complement representations. Common codes like binary coded decimal, excess-3, and gray codes are defined along with their properties. NAND and NOR gates are identified as universal gates that can be used to implement any logical function. Methods for constructing common logic gates using only NAND gates are presented.
The document discusses number base conversions between binary, decimal, octal, and hexadecimal number systems. It provides examples and steps for converting between these different number systems. Conversions include changing the integral and fractional parts of decimal numbers, grouping bits into the correct number of bits for the target base, and multiplying/dividing by the place value of each position.
The document discusses iron loss in the armature of a DC machine. It explains that hysteresis loss occurs in the armature core due to magnetic field reversal as it passes under poles of different polarity. It also explains that eddy current loss is the power loss from eddy currents induced in the armature core by the magnetic field as the armature rotates. The maximum efficiency condition for a DC machine is also mentioned.
This document discusses lap and wave winding methods for electrical generators. Lap winding involves connecting the ends of coils to the same segment of a commutator. Wave winding connects the starting end of one coil to the end of the next coil of the same polarity. An example problem calculates the induced EMF and armature current of a short-shunt compound generator delivering 30A at 220V. The document provides guidance to refer to notes for better understanding generator equations and examples involving speed and load current calculations. Students are assigned math problems related to the content covered.
The document discusses the construction and working principles of a simple DC generator. It explains that a rotating coil inside a magnetic field will generate an alternating current in the coil. To make the output current unidirectional, slip rings are replaced with a split-ring commutator. The commutator has two segments that are insulated from each other and connected to the coil ends. As the coil rotates, the commutator reverses the direction of the current flow, rectifying it to produce a unidirectional current in the external circuit. An actual DC generator consists of additional key components like magnetic poles, field coils, an armature core and windings, commutator, and brushes to generate a steady direct
There are two types of generators: DC generators and AC generators. Both work on the principle of Faraday's laws of electromagnetic induction to convert mechanical energy into electrical energy. DC generators produce direct current, while AC generators produce alternating current. The generator consists of a coil of wire placed in a changing magnetic field. According to Faraday's laws, any change in the magnetic flux through the coil will induce an electromotive force (emf) in the coil.
This document summarizes the performance analysis of non-line-of-sight (NLOS) ultraviolet (UV) communication using serial relay. It discusses how using relays can help overcome challenges of NLOS communication such as high path loss, low signal-to-noise ratio, and limited range. It presents the system model, analyzes path loss, received power, SNR, outage probability, and bit error rate with different numbers of relays. Simulation results show that using relays can enhance signal strength and reduce attenuation effects compared to NLOS without relays. The analysis demonstrates relays improve feasibility and performance of NLOS UV communication.
Rainfall intensity duration frequency curve statistical analysis and modeling...bijceesjournal
Using data from 41 years in Patna’ India’ the study’s goal is to analyze the trends of how often it rains on a weekly, seasonal, and annual basis (1981−2020). First, utilizing the intensity-duration-frequency (IDF) curve and the relationship by statistically analyzing rainfall’ the historical rainfall data set for Patna’ India’ during a 41 year period (1981−2020), was evaluated for its quality. Changes in the hydrologic cycle as a result of increased greenhouse gas emissions are expected to induce variations in the intensity, length, and frequency of precipitation events. One strategy to lessen vulnerability is to quantify probable changes and adapt to them. Techniques such as log-normal, normal, and Gumbel are used (EV-I). Distributions were created with durations of 1, 2, 3, 6, and 24 h and return times of 2, 5, 10, 25, and 100 years. There were also mathematical correlations discovered between rainfall and recurrence interval.
Findings: Based on findings, the Gumbel approach produced the highest intensity values, whereas the other approaches produced values that were close to each other. The data indicates that 461.9 mm of rain fell during the monsoon season’s 301st week. However, it was found that the 29th week had the greatest average rainfall, 92.6 mm. With 952.6 mm on average, the monsoon season saw the highest rainfall. Calculations revealed that the yearly rainfall averaged 1171.1 mm. Using Weibull’s method, the study was subsequently expanded to examine rainfall distribution at different recurrence intervals of 2, 5, 10, and 25 years. Rainfall and recurrence interval mathematical correlations were also developed. Further regression analysis revealed that short wave irrigation, wind direction, wind speed, pressure, relative humidity, and temperature all had a substantial influence on rainfall.
Originality and value: The results of the rainfall IDF curves can provide useful information to policymakers in making appropriate decisions in managing and minimizing floods in the study area.
Gas agency management system project report.pdfKamal Acharya
The project entitled "Gas Agency" is done to make the manual process easier by making it a computerized system for billing and maintaining stock. The Gas Agencies get the order request through phone calls or by personal from their customers and deliver the gas cylinders to their address based on their demand and previous delivery date. This process is made computerized and the customer's name, address and stock details are stored in a database. Based on this the billing for a customer is made simple and easier, since a customer order for gas can be accepted only after completing a certain period from the previous delivery. This can be calculated and billed easily through this. There are two types of delivery like domestic purpose use delivery and commercial purpose use delivery. The bill rate and capacity differs for both. This can be easily maintained and charged accordingly.
Applications of artificial Intelligence in Mechanical Engineering.pdfAtif Razi
Historically, mechanical engineering has relied heavily on human expertise and empirical methods to solve complex problems. With the introduction of computer-aided design (CAD) and finite element analysis (FEA), the field took its first steps towards digitization. These tools allowed engineers to simulate and analyze mechanical systems with greater accuracy and efficiency. However, the sheer volume of data generated by modern engineering systems and the increasing complexity of these systems have necessitated more advanced analytical tools, paving the way for AI.
AI offers the capability to process vast amounts of data, identify patterns, and make predictions with a level of speed and accuracy unattainable by traditional methods. This has profound implications for mechanical engineering, enabling more efficient design processes, predictive maintenance strategies, and optimized manufacturing operations. AI-driven tools can learn from historical data, adapt to new information, and continuously improve their performance, making them invaluable in tackling the multifaceted challenges of modern mechanical engineering.
Discover the latest insights on Data Driven Maintenance with our comprehensive webinar presentation. Learn about traditional maintenance challenges, the right approach to utilizing data, and the benefits of adopting a Data Driven Maintenance strategy. Explore real-world examples, industry best practices, and innovative solutions like FMECA and the D3M model. This presentation, led by expert Jules Oudmans, is essential for asset owners looking to optimize their maintenance processes and leverage digital technologies for improved efficiency and performance. Download now to stay ahead in the evolving maintenance landscape.
Comparative analysis between traditional aquaponics and reconstructed aquapon...bijceesjournal
The aquaponic system of planting is a method that does not require soil usage. It is a method that only needs water, fish, lava rocks (a substitute for soil), and plants. Aquaponic systems are sustainable and environmentally friendly. Its use not only helps to plant in small spaces but also helps reduce artificial chemical use and minimizes excess water use, as aquaponics consumes 90% less water than soil-based gardening. The study applied a descriptive and experimental design to assess and compare conventional and reconstructed aquaponic methods for reproducing tomatoes. The researchers created an observation checklist to determine the significant factors of the study. The study aims to determine the significant difference between traditional aquaponics and reconstructed aquaponics systems propagating tomatoes in terms of height, weight, girth, and number of fruits. The reconstructed aquaponics system’s higher growth yield results in a much more nourished crop than the traditional aquaponics system. It is superior in its number of fruits, height, weight, and girth measurement. Moreover, the reconstructed aquaponics system is proven to eliminate all the hindrances present in the traditional aquaponics system, which are overcrowding of fish, algae growth, pest problems, contaminated water, and dead fish.
Electric vehicle and photovoltaic advanced roles in enhancing the financial p...IJECEIAES
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2. Ronak S Sutariya
Ronak S Sutariya
Branch :
Branch :Computer
Computer
Sub:
Sub: Elements Of Electrical Engineering
Elements Of Electrical Engineering
Enrollment No:
Enrollment No: 151290107052
151290107052
Topic :
Topic : A.
A. C CIRCUITS
C CIRCUITS
3. θ
450
900
1350
1800
2700
3600
E
R = Emax
E = Emax sin θ
Rotating Vector Description
Rotating Vector Description
The coordinate of the emf at any instant is the
value of Emax sin θ. Observe for incremental
angles in steps of 450
. Same is true for i.
The coordinate of the emf at any instant is the
value of Emax sin θ. Observe for incremental
angles in steps of 450
. Same is true for i.
θ
450
900
1350
1800
2700
3600
E
Radius = Emax
E = Emax sin θ
4. Effective AC Current
Effective AC Current
i
imax
max
The average current
The average current
in a cycle is zero—
in a cycle is zero—
half + and half -.
half + and half -.
But energy is expended,
But energy is expended,
regardless of direction.
regardless of direction.
So the
So the “root-mean-
“root-mean-
square”
square” value is useful.
value is useful.
2
2 0.707
rms
I I
I = =
I = imax
The
The rms
rms value
value I
Irms
rms is
is
sometimes called the
sometimes called the
effective
effective current
current I
Ieff
eff:
:
The effective ac current:
ieff = 0.707 imax
5. AC Definitions
AC Definitions
One
One effective ampere
effective ampere is that ac current for
is that ac current for
which the power is the same as for one
which the power is the same as for one
ampere of dc current.
ampere of dc current.
One
One effective volt
effective volt is that ac voltage that
is that ac voltage that
gives an effective ampere through a
gives an effective ampere through a
resistance of one ohm.
resistance of one ohm.
Effective current: ieff = 0.707 imax
Effective current: ieff = 0.707 imax
Effective voltage: Veff = 0.707 Vmax
Effective voltage: Veff = 0.707 Vmax
6. Pure Resistance in AC Circuits
Pure Resistance in AC Circuits
A
a.c. Source
R
V
Voltage and current are in phase, and Ohm’s
Voltage and current are in phase, and Ohm’s
law applies for effective currents and voltages.
law applies for effective currents and voltages.
Voltage and current are in phase, and Ohm’s
Voltage and current are in phase, and Ohm’s
law applies for effective currents and voltages.
law applies for effective currents and voltages.
Ohm’s law: Veff = ieffR
Vmax
i
imax
max
Voltage
Current
7. AC and Inductors
AC and Inductors
Time, t
I
i
Current
Current
Rise
Rise
τ
0.63I
Inductor
The voltage
The voltage V
V peaks first, causing rapid rise in
peaks first, causing rapid rise in i
i
current which then peaks as the emf goes to zero.
current which then peaks as the emf goes to zero.
Voltage
Voltage leads
leads (
(peaks before
peaks before) the current by 90
) the current by 900
0
.
.
Voltage and current are out of phase
Voltage and current are out of phase.
.
Time, t
I i
Current
Current
Decay
Decay
τ
0.37I
Inductor
8. A Pure Inductor in AC Circuit
A Pure Inductor in AC Circuit
A
L
V
a.c.
Vmax
i
imax
max
Voltage
Current
The voltage peaks 90
The voltage peaks 900
0
before the current peaks.
before the current peaks.
One builds as the other falls and vice versa.
One builds as the other falls and vice versa.
The voltage peaks 90
The voltage peaks 900
0
before the current peaks.
before the current peaks.
One builds as the other falls and vice versa.
One builds as the other falls and vice versa.
The
The reactance
reactance may be defined as the
may be defined as the nonresistive
nonresistive
opposition
opposition to the flow of ac current.
to the flow of ac current.
9. Inductive Reactance
Inductive Reactance
A
L
V
a.c.
The
The back
back emf
emf induced
induced
by a changing current
by a changing current
provides opposition to
provides opposition to
current, called
current, called inductive
inductive
reactance X
reactance XL
L.
.
Such losses are
Such losses are temporary
temporary, however, since the
, however, since the
current
current changes direction
changes direction, periodically re-supplying
, periodically re-supplying
energy so that no net power is lost in one cycle.
energy so that no net power is lost in one cycle.
Inductive reactance
Inductive reactance X
XL
L is a function of both the
is a function of both the
inductance
inductance and the
and the frequency
frequency of the ac current.
of the ac current.
10. Calculating Inductive Reactance
Calculating Inductive Reactance
A
L
V
a.c.
Inductive Reactance:
2 Unit is the
L
X fL
π
= Ω
Ohm's law: L L
V iX
=
The
The voltage
voltage reading
reading V
V in the above circuit at the
in the above circuit at the
instant the
instant the ac
ac current is
current is i
i can be found from the
can be found from the
inductance
inductance in
in H
H and the
and the frequency
frequency in
in Hz
Hz.
.
(2 )
L
V i fL
π
= Ohm’s law: VL = ieffXL
11. AC and
AC and
Capacitance
Capacitance
Time, t
Qmax
q
Rise in
Rise in
Charge
Charge
Capacitor
τ
0.63 I
Time, t
I
i
Current
Current
Decay
Decay
Capacitor
τ
0.37 I
The voltage
The voltage V
V peaks ¼ of a cycle after the current
peaks ¼ of a cycle after the current
i
i reaches its maximum. The voltage
reaches its maximum. The voltage lags
lags the
the
current.
current. Current
Current i
i and V out of phase
and V out of phase.
.
12. A Pure Capacitor in AC
A Pure Capacitor in AC
Circuit
Circuit
Vmax
i
imax
max
Voltage
Current
A V
a.c.
C
The voltage peaks 90
The voltage peaks 900
0
after
after the current peaks.
the current peaks.
One builds as the other falls and vice versa.
One builds as the other falls and vice versa.
The voltage peaks 90
The voltage peaks 900
0
after
after the current peaks.
the current peaks.
One builds as the other falls and vice versa.
One builds as the other falls and vice versa.
The diminishing current
The diminishing current i
i builds charge on
builds charge on C
C
which increases the
which increases the back emf
back emf of
of V
VC
C.
.
The diminishing current
The diminishing current i
i builds charge on
builds charge on C
C
which increases the
which increases the back emf
back emf of
of V
VC
C.
.
13. Capacitive Reactance
Capacitive Reactance
No
No net power
net power is lost in a complete cycle, even
is lost in a complete cycle, even
though the capacitor does provide nonresistive
though the capacitor does provide nonresistive
opposition (
opposition (reactance
reactance) to the flow of ac current.
) to the flow of ac current.
Capacitive reactance
Capacitive reactance X
XC
C is affected by both the
is affected by both the
capacitance
capacitance and the
and the frequency
frequency of the ac current.
of the ac current.
A V
a.c.
C
Energy
Energy gains and
gains and
losses are also
losses are also
temporary
temporary for capacitors
for capacitors
due to the constantly
due to the constantly
changing ac current.
changing ac current.
14. Calculating Inductive Reactance
Calculating Inductive Reactance
Capacitive Reactance:
1
Unit is the
2
C
X
fC
π
= Ω
Ohm's law: VC C
iX
=
The
The voltage
voltage reading
reading V
V in the above circuit at the
in the above circuit at the
instant the
instant the ac
ac current is
current is i
i can be found from the
can be found from the
inductance
inductance in
in F
F and the
and the frequency
frequency in
in Hz
Hz.
.
2
L
i
V
fL
π
=
A V
a.c.
C
Ohm’s law: VC = ieffXC
15. Series LRC Circuits
Series LRC Circuits
L
VR VC
C
R
a.c.
VL
VT
A
Series ac circuit
Consider an
Consider an inductor
inductor L
L,
, a
a capacitor
capacitor C
C,
, and
and
a
a resistor
resistor R
R all connected in
all connected in series
series with
with an
an
ac source
ac source. The instantaneous current and
. The instantaneous current and
voltages can be measured with meters.
voltages can be measured with meters.
Consider an
Consider an inductor
inductor L
L,
, a
a capacitor
capacitor C
C,
, and
and
a
a resistor
resistor R
R all connected in
all connected in series
series with
with an
an
ac source
ac source. The instantaneous current and
. The instantaneous current and
voltages can be measured with meters.
voltages can be measured with meters.
16. Phase in a Series AC Circuit
Phase in a Series AC Circuit
The voltage
The voltage leads
leads current in an inductor and
current in an inductor and lags
lags
current in a capacitor.
current in a capacitor. In phase
In phase for resistance
for resistance R
R.
.
θ
450
900
1350
1800
2700
3600
V V = Vmax sin θ
VR
VC
VL
Rotating
Rotating phasor diagram
phasor diagram generates voltage
generates voltage
waves for each element
waves for each element R
R,
, L
L, and
, and C
C showing
showing
phase relations. Current
phase relations. Current i
i is always
is always in phase
in phase with
with
V
VR.
R.
17. Impedance in an AC Circuit
Impedance in an AC Circuit
φ
R
XL - XC
Z
Z
Impedance
Impedance 2 2
( )
T L C
V i R X X
= + −
Impedance
Impedance Z
Z is defined:
is defined:
2 2
( )
L C
Z R X X
= + −
Ohm’s law for ac current
Ohm’s law for ac current
and impedance:
and impedance:
or T
T
V
V iZ i
Z
= =
The impedance is the combined opposition to ac
current consisting of both resistance and reactance.
The impedance is the combined opposition to ac
current consisting of both resistance and reactance.
18. Power in an AC Circuit
Power in an AC Circuit
No power is consumed by inductance or
No power is consumed by inductance or
capacitance. Thus power is a function of the
capacitance. Thus power is a function of the
component of the impedance along resistance:
component of the impedance along resistance:
No power is consumed by inductance or
No power is consumed by inductance or
capacitance. Thus power is a function of the
capacitance. Thus power is a function of the
component of the impedance along resistance:
component of the impedance along resistance:
In terms of ac voltage:
In terms of ac voltage:
P = iV cos φ
P = iV cos φ
In terms of the resistance R:
In terms of the resistance R:
P = i2
R
P = i2
R
φ
R
XL - XC
Z
Z
Impedance
Impedance
P
P lost in
lost in R
R only
only
The fraction
The fraction Cos
Cos φ
φ is known as the
is known as the power factor.
power factor.
19. The Transformer
The Transformer
A
A transformer
transformer is a device that uses induction
is a device that uses induction
and ac current to step voltages up or down.
and ac current to step voltages up or down.
R
a.c.
Np Ns
Transformer
P P
N
t
∆Φ
= −
∆
E S S
N
t
∆Φ
= −
∆
E
Induced
emf’s are:
Induced
emf’s are:
An ac source of emf
An ac source of emf
E
Ep
p is connected to
is connected to
primary coil with
primary coil with N
Np
p
turns. Secondary has
turns. Secondary has
N
Ns
s turns and emf of
turns and emf of E
Es
s.
.
An ac source of emf
An ac source of emf
E
Ep
p is connected to
is connected to
primary coil with
primary coil with N
Np
p
turns. Secondary has
turns. Secondary has
N
Ns
s turns and emf of
turns and emf of E
Es
s.
.
20. Transformers (Continued):
Transformers (Continued):
R
a.c.
Np Ns
Transformer
P P
N
t
∆Φ
= −
∆
E
S S
N
t
∆Φ
= −
∆
E
Recognizing that
Recognizing that ∆φ
∆φ/
/∆
∆t
t is the same in each coil,
is the same in each coil,
we divide first relation by second and obtain:
we divide first relation by second and obtain:
The transformer
equation:
The transformer
equation:
P P
S S
N
N
=
E
E
21. Transformer Efficiency
Transformer Efficiency
There is no power gain in stepping up the voltage
There is no power gain in stepping up the voltage
since voltage is increased by reducing current. In
since voltage is increased by reducing current. In
an ideal transformer with no internal losses:
an ideal transformer with no internal losses:
or S
P
P P S S
s P
i
i i
i
= =
E
E E
E
An ideal
An ideal
transformer:
transformer:
R
a.c.
Np Ns
Ideal Transformer
The above equation assumes no internal energy
The above equation assumes no internal energy
losses due to heat or flux changes.
losses due to heat or flux changes. Actual
Actual
efficiencies
efficiencies are usually between
are usually between 90 and 100%.
90 and 100%.
The above equation assumes no internal energy
The above equation assumes no internal energy
losses due to heat or flux changes.
losses due to heat or flux changes. Actual
Actual
efficiencies
efficiencies are usually between
are usually between 90 and 100%.
90 and 100%.
22. Summary
Summary
Effective current: ieff = 0.707 imax
Effective current: ieff = 0.707 imax
Effective voltage: Veff = 0.707 Vmax
Effective voltage: Veff = 0.707 Vmax
Inductive Reactance:
2 Unit is the
L
X fL
π
= Ω
Ohm's law: L L
V iX
=
Capacitive Reactance:
1
Unit is the
2
C
X
fC
π
= Ω
Ohm's law: VC C
iX
=
23. Summary (Cont.)
Summary (Cont.)
2 2
( )
T R L C
V V V V
= + − tan L C
R
V V
V
φ
−
=
2 2
( )
L C
Z R X X
= + −
or T
T
V
V iZ i
Z
= =
tan L C
X X
R
φ
−
=
1
2
r
f
LC
π
=
24. Summary (Cont.)
Summary (Cont.)
In terms of ac voltage:
In terms of ac voltage:
P = iV cos φ
P = iV cos φ
In terms of the resistance R:
In terms of the resistance R:
P = i2
R
P = i2
R
Power in AC Circuits:
Power in AC Circuits:
P P
S S
N
N
=
E
E P P S S
i i
=
E E
Transformers:
Transformers: