Torque is generated in a current-carrying conductor when placed in a magnetic field due to forces acting perpendicular to both the current and the magnetic field. This causes the conductor to rotate. The magnitude of the torque depends on factors like the magnetic field strength, current, number of turns in the conductor, and the angle between the field and conductor. As the conductor rotates in the magnetic field, an alternating electromotive force (emf) is induced that can be used to generate electric power. The power generated depends on the torque and rotational speed of the conductor. Power efficiency is calculated as the ratio of output power to input power.
The document discusses permanent magnet DC motors (PMDC). It describes the basic construction and working of PMDC motors, including that they have permanent magnets on the stator instead of a field winding. There are two main types - brushed and brushless. Brushed PMDC motors work similarly to other DC motors, with the rotor armature experiencing force from the magnetic field to cause rotation. PMDC motors have advantages like not requiring field excitation, reducing size and cost. Applications include automotive starters, toys, appliances and computer drives.
This document discusses direct current (DC) motors and generators. It describes the basic components and operation of a DC motor, including how a rotating coil in a magnetic field can operate as both a motor and generator. When a voltage is applied to the motor, it causes a current through the coil which interacts with the magnetic field to produce rotation. As the coil rotates, it generates a back EMF proportional to its rotation speed.
The document then discusses different types of DC motors in more detail, including separately excited DC motors/generators where the field and armature coils have independent power sources, and self-excited shunt wound DC motors/generators where the field coil is connected in parallel with the armature winding.
1. The document discusses electro-mechanical energy conversion in plunger and rotating systems using a coil, plunger/rotor, and air gap.
2. It examines the change in stored magnetic energy and mechanical work done when the plunger/rotor moves due to a change in the air gap inductance.
3. The difference between the supplied electrical energy and change in stored energy equals the mechanical work done on the plunger/rotor.
The document discusses rotating electrical machines such as generators and motors. It covers topics such as:
- The basic components of rotating machines including stators, rotors, field windings, and armature windings.
- How electromechanical energy conversion occurs through relative movement between coils and magnetic fields.
- Different types of rotor designs for low and high speed applications.
- Constructional features of synchronous and induction machines including placement of field and armature windings.
- Types of windings used in three-phase alternators such as star and delta connections.
Direct-current (DC) machines can operate as motors or generators. They have stationary and rotating parts, with the rotor containing windings connected to a commutator. In a DC motor, current in the rotor windings interacts with the magnetic field from stationary field windings to produce torque. Generators operate on the same principles but convert mechanical power to electrical power by inducing current in the rotor windings. The key characteristics of DC machines include their use of commutation to produce unidirectional current and the orthogonality of magnetic fields from the rotor and field windings.
This document provides information about experiments conducted in an electrical machines lab at Mehran University of Engineering and Technology. It includes an index listing 12 experiments conducted between August and October on topics like DC generators, motors, and control systems. Practical 1 provides an introduction to electrical machine equipment like DC motors, generators, transformers, and control panels. It describes the components and operating principles. The document also includes circuit diagrams, readings tables and conclusions from experiments verifying open circuit characteristics of separately excited DC generators and self-excited series DC generators.
The left-hand rule for motors is used to determine the direction of force and motion produced on a current-carrying conductor in a magnetic field.
To use the left-hand rule:
1. Point the thumb of your left hand in the direction of the magnetic field lines.
2. Point your index finger in the direction of the current flowing through the conductor.
3. Your middle finger will now point in the direction of the force on the conductor due to the interaction of the current and magnetic field.
The direction of the force gives the direction of motion of the conductor. This principle is used in DC motors to generate a rotational motion from an electrical current.
The document discusses permanent magnet DC motors (PMDC). It describes the basic construction and working of PMDC motors, including that they have permanent magnets on the stator instead of a field winding. There are two main types - brushed and brushless. Brushed PMDC motors work similarly to other DC motors, with the rotor armature experiencing force from the magnetic field to cause rotation. PMDC motors have advantages like not requiring field excitation, reducing size and cost. Applications include automotive starters, toys, appliances and computer drives.
This document discusses direct current (DC) motors and generators. It describes the basic components and operation of a DC motor, including how a rotating coil in a magnetic field can operate as both a motor and generator. When a voltage is applied to the motor, it causes a current through the coil which interacts with the magnetic field to produce rotation. As the coil rotates, it generates a back EMF proportional to its rotation speed.
The document then discusses different types of DC motors in more detail, including separately excited DC motors/generators where the field and armature coils have independent power sources, and self-excited shunt wound DC motors/generators where the field coil is connected in parallel with the armature winding.
1. The document discusses electro-mechanical energy conversion in plunger and rotating systems using a coil, plunger/rotor, and air gap.
2. It examines the change in stored magnetic energy and mechanical work done when the plunger/rotor moves due to a change in the air gap inductance.
3. The difference between the supplied electrical energy and change in stored energy equals the mechanical work done on the plunger/rotor.
The document discusses rotating electrical machines such as generators and motors. It covers topics such as:
- The basic components of rotating machines including stators, rotors, field windings, and armature windings.
- How electromechanical energy conversion occurs through relative movement between coils and magnetic fields.
- Different types of rotor designs for low and high speed applications.
- Constructional features of synchronous and induction machines including placement of field and armature windings.
- Types of windings used in three-phase alternators such as star and delta connections.
Direct-current (DC) machines can operate as motors or generators. They have stationary and rotating parts, with the rotor containing windings connected to a commutator. In a DC motor, current in the rotor windings interacts with the magnetic field from stationary field windings to produce torque. Generators operate on the same principles but convert mechanical power to electrical power by inducing current in the rotor windings. The key characteristics of DC machines include their use of commutation to produce unidirectional current and the orthogonality of magnetic fields from the rotor and field windings.
This document provides information about experiments conducted in an electrical machines lab at Mehran University of Engineering and Technology. It includes an index listing 12 experiments conducted between August and October on topics like DC generators, motors, and control systems. Practical 1 provides an introduction to electrical machine equipment like DC motors, generators, transformers, and control panels. It describes the components and operating principles. The document also includes circuit diagrams, readings tables and conclusions from experiments verifying open circuit characteristics of separately excited DC generators and self-excited series DC generators.
The left-hand rule for motors is used to determine the direction of force and motion produced on a current-carrying conductor in a magnetic field.
To use the left-hand rule:
1. Point the thumb of your left hand in the direction of the magnetic field lines.
2. Point your index finger in the direction of the current flowing through the conductor.
3. Your middle finger will now point in the direction of the force on the conductor due to the interaction of the current and magnetic field.
The direction of the force gives the direction of motion of the conductor. This principle is used in DC motors to generate a rotational motion from an electrical current.
This document provides background information on DC motors and generators. It describes their basic construction and operating principles. Key points include:
- DC machines produce torque through the interaction of stationary and rotating magnetic fields in the stator and armature.
- Motors use current switching in the armature coils to produce a rotating magnetic field that causes torque. Generators use a rotating armature field to induce voltage in the stationary stator coils.
- The document outlines the different types of DC motor connections and their speed-torque characteristics. It also provides procedures to experimentally determine the characteristics of a given DC machine.
This document discusses the theory and experimental procedures for determining the load characteristics of DC shunt, series, and compound motors. The experiments involve constructing circuits for each motor type and measuring speed, current, torque, power, and efficiency at increasing loads. Load characteristics such as speed regulation, starting torque, and efficiency are then determined and compared between motor types from the experimental results.
1. DC motors operate by converting electrical energy from a power source into mechanical energy. They consist of a stationary stator and a rotating rotor made of coils that interact with magnetic fields.
2. DC motors are classified as either separately excited, shunt, or series motors depending on how their field and armature windings are electrically connected. Separately excited motors have independent field and armature circuits while shunt and series motors have their field windings connected in parallel or series to the armature winding, respectively.
3. In a DC motor, torque is produced by the interaction between current in the rotor coils and the magnetic field from the stator. As the rotor rotates, a counter-voltage or
The document discusses transformers and DC machines. It provides definitions, explanations of principles of operation, parts, types and equations for transformers, DC generators and DC motors. Key points include:
- Transformers transfer power from one circuit to another via electromagnetic induction without changing frequency.
- DC generators convert mechanical energy to electrical energy via the principle of dynamically induced EMF. DC motors operate inversely.
- Transformers, generators and motors each have windings, cores/frames and produce/use magnetic fields in their operation.
- Equations provided relate induced EMF, current, voltage, speed and other variables.
DC machines can be generators or motors. DC generators convert mechanical energy to DC voltage and current using magnetic induction. They have an armature that rotates inside magnetic fields produced by poles. The armature is connected to a commutator that changes the alternating voltage induced in the armature to pulsating DC voltage. DC motors convert electrical energy to mechanical energy by supplying DC power to an armature within magnetic fields, and are used widely in applications. Major parts include the rotor (armature) and stator (field coils).
The magnetization characteristic is different for increasing and decreasing values of field current (lf) due to hysteresis effect in the magnetic circuit of the generator. Hysteresis is the phenomenon due to which the magnetic domains in the iron core of the generator do not align instantaneously with the changing field current, resulting in a lag between the applied field current and the induced voltage. This causes the magnetization curve to form a loop instead of a single valued curve.
This document provides an overview of DC motors, including their basic working principles, types (shunt, series, compound), characteristics such as torque-current and speed-current relationships, and components like armature and field windings. It describes how DC motors function by converting electrical energy from a power source into mechanical rotation of an armature, and how speed can be controlled through varying the current. Losses within the motor such as copper and iron losses are also discussed.
This document discusses losses and efficiency in AC machines like alternators. It lists the main types of losses as copper losses, magnetic losses, and mechanical losses. It then provides examples of efficiency calculations for various alternators operating at different loads and power factors. Several problems are also presented for calculating alternator efficiencies based on given parameters like output power, resistance, losses, and operating power factor.
The document describes different testing methods for DC machines. It discusses the simple/direct test method, Swinburne's indirect test method, and Hopkinson's regenerative test method. The simple/direct test method calculates efficiency by directly loading the DC machine, but it is only suitable for small machines. Swinburne's method measures no-load losses to determine efficiency indirectly. Hopkinson's method couples two identical DC machines together to test them simultaneously, with one acting as a motor and the other as a generator.
This document discusses the operation of DC generators and motors. It begins by explaining how a generator converts mechanical energy to electrical energy through the process of electromagnetic induction. It then describes the basic components of a DC generator, including the yoke, pole cores, field coils, armature core, commutator, and brushes. The document discusses different types of DC generators such as shunt generators, series generators, and compound generators. It also covers topics such as dynamically induced EMF, Fleming's right hand rule, and the construction and working of a simple loop generator.
This document discusses the working principle of a DC motor. It begins by introducing DC motors and stating that they convert DC electrical energy to mechanical energy. It then explains the basic components of a DC motor and how current flowing through the armature in a magnetic field produces torque, causing the motor to rotate. It details Fleming's left hand rule for determining the direction of rotation. The document also discusses how back EMF is produced and how it allows the motor to maintain constant speed under varying loads.
This document discusses DC generators and motors. It begins by explaining how a rotating loop of wire in a magnetic field produces an alternating current (AC). It then describes how using split rings and brushes converts this to direct current (DC) in a generator. The key parts of a DC generator are identified as the stator, rotor and commutator. Expressions are given for the generated voltage in terms of machine parameters like speed, flux and number of turns. Different methods of field excitation like shunt, series and compound connections are explained. The buildup process of a self-excited shunt generator is described. External characteristics graphs of voltage versus current are shown for separately and shunt excited generators.
The document contains examples and problems about a simple rotating loop electrical machine. Example 1 part (a) asks what happens when a switch connecting the machine to a battery is closed. Parts (b) through (e) calculate machine parameters like starting current, speed, and power under different load and operating conditions. Problem 1 provides additional machine specifications and asks questions about whether it is operating as a motor or generator, and how current and power output would change with different rotor speeds.
Emc510 s emec_lect_notes_sem-1_2016_lecture-2Timoteus Ikaku
(1) The document discusses the principles of electro-mechanical energy conversion in machines. It describes how an electromagnetic machine provides a reversible means of energy flow between an electrical energy system and another system, usually mechanical, through a magnetic field.
(2) The energy conversion process involves the magnetic field temporarily storing energy transferred from one system to the other before releasing it to the other system. Motors convert electrical to mechanical energy while generators do the reverse.
(3) Electromagnetic machines can develop mechanical force in two ways: through alignment which acts to minimize magnetic reluctance, or through interaction between magnetic fields produced by current and magnets.
1) Electromechanical energy conversion theory represents electromagnetic force or torque in terms of device variables like currents and mechanical displacement.
2) An electromechanical system consists of an electric system, mechanical system, and means for them to interact via a coupling field.
3) The total energy supplied to the coupling field equals the energy transferred from the electric system plus the energy transferred from the mechanical system.
The document discusses electromechanical energy conversion in systems consisting of electric and mechanical components coupled through an interaction field. It presents equations showing that the total energy transferred to the coupling field (WF) is equal to the energy supplied by the electric system (WE) plus the energy supplied by the mechanical system (WM). The energy transfer is also affected by losses in the electric, mechanical and coupling field components. It further derives an expression for the electromagnetic force (fe) in terms of the device variables like current (i) and displacement (x).
This document discusses alternating current (AC) circuits. It begins by describing how an alternating electromotive force (EMF) is generated using a coil rotating in a magnetic field. Equations are provided showing that both the induced EMF and current vary as sine functions. Common terms used in AC circuits like cycle, frequency, phase, and root mean square (RMS) value are defined. Phasor diagrams are introduced to represent AC quantities in terms of magnitude and direction. Derivations of average and RMS values are shown. Finally, a purely resistive AC circuit is analyzed, showing the current is in phase with voltage and both follow sine waves. Power calculations are also demonstrated.
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 https://ekeeda.com/streamdetails/stream/Electrical-Engineering
This document provides an introduction and overview of alternating current (AC) circuits. It discusses various topics including:
1) AC waveforms such as sinusoidal waves and their advantages over other waveforms.
2) How alternating voltage and current are generated using devices like alternators that rotate a coil in a magnetic field.
3) Key concepts in AC circuits like phase, phase difference, RMS and average values, and phasor representation.
4) How AC behaves when passing through circuit elements like resistors, inductors, and capacitors.
The document contains explanations, diagrams and equations related to these fundamental AC circuit concepts.
This document provides an introduction and overview of alternating current (AC) circuits. It discusses various topics including:
1) AC waveforms such as sinusoidal waves and their advantages over other waveforms.
2) How alternating voltage and current are generated using devices like alternators that rotate a coil in a magnetic field.
3) Key concepts in AC circuits like phase, phase difference, RMS and average values, and phasor representation.
4) How AC behaves when passing through circuit elements like resistors, inductors, and capacitors.
The document contains explanations, diagrams and equations related to these fundamental AC circuit analysis topics.
This document provides background information on DC motors and generators. It describes their basic construction and operating principles. Key points include:
- DC machines produce torque through the interaction of stationary and rotating magnetic fields in the stator and armature.
- Motors use current switching in the armature coils to produce a rotating magnetic field that causes torque. Generators use a rotating armature field to induce voltage in the stationary stator coils.
- The document outlines the different types of DC motor connections and their speed-torque characteristics. It also provides procedures to experimentally determine the characteristics of a given DC machine.
This document discusses the theory and experimental procedures for determining the load characteristics of DC shunt, series, and compound motors. The experiments involve constructing circuits for each motor type and measuring speed, current, torque, power, and efficiency at increasing loads. Load characteristics such as speed regulation, starting torque, and efficiency are then determined and compared between motor types from the experimental results.
1. DC motors operate by converting electrical energy from a power source into mechanical energy. They consist of a stationary stator and a rotating rotor made of coils that interact with magnetic fields.
2. DC motors are classified as either separately excited, shunt, or series motors depending on how their field and armature windings are electrically connected. Separately excited motors have independent field and armature circuits while shunt and series motors have their field windings connected in parallel or series to the armature winding, respectively.
3. In a DC motor, torque is produced by the interaction between current in the rotor coils and the magnetic field from the stator. As the rotor rotates, a counter-voltage or
The document discusses transformers and DC machines. It provides definitions, explanations of principles of operation, parts, types and equations for transformers, DC generators and DC motors. Key points include:
- Transformers transfer power from one circuit to another via electromagnetic induction without changing frequency.
- DC generators convert mechanical energy to electrical energy via the principle of dynamically induced EMF. DC motors operate inversely.
- Transformers, generators and motors each have windings, cores/frames and produce/use magnetic fields in their operation.
- Equations provided relate induced EMF, current, voltage, speed and other variables.
DC machines can be generators or motors. DC generators convert mechanical energy to DC voltage and current using magnetic induction. They have an armature that rotates inside magnetic fields produced by poles. The armature is connected to a commutator that changes the alternating voltage induced in the armature to pulsating DC voltage. DC motors convert electrical energy to mechanical energy by supplying DC power to an armature within magnetic fields, and are used widely in applications. Major parts include the rotor (armature) and stator (field coils).
The magnetization characteristic is different for increasing and decreasing values of field current (lf) due to hysteresis effect in the magnetic circuit of the generator. Hysteresis is the phenomenon due to which the magnetic domains in the iron core of the generator do not align instantaneously with the changing field current, resulting in a lag between the applied field current and the induced voltage. This causes the magnetization curve to form a loop instead of a single valued curve.
This document provides an overview of DC motors, including their basic working principles, types (shunt, series, compound), characteristics such as torque-current and speed-current relationships, and components like armature and field windings. It describes how DC motors function by converting electrical energy from a power source into mechanical rotation of an armature, and how speed can be controlled through varying the current. Losses within the motor such as copper and iron losses are also discussed.
This document discusses losses and efficiency in AC machines like alternators. It lists the main types of losses as copper losses, magnetic losses, and mechanical losses. It then provides examples of efficiency calculations for various alternators operating at different loads and power factors. Several problems are also presented for calculating alternator efficiencies based on given parameters like output power, resistance, losses, and operating power factor.
The document describes different testing methods for DC machines. It discusses the simple/direct test method, Swinburne's indirect test method, and Hopkinson's regenerative test method. The simple/direct test method calculates efficiency by directly loading the DC machine, but it is only suitable for small machines. Swinburne's method measures no-load losses to determine efficiency indirectly. Hopkinson's method couples two identical DC machines together to test them simultaneously, with one acting as a motor and the other as a generator.
This document discusses the operation of DC generators and motors. It begins by explaining how a generator converts mechanical energy to electrical energy through the process of electromagnetic induction. It then describes the basic components of a DC generator, including the yoke, pole cores, field coils, armature core, commutator, and brushes. The document discusses different types of DC generators such as shunt generators, series generators, and compound generators. It also covers topics such as dynamically induced EMF, Fleming's right hand rule, and the construction and working of a simple loop generator.
This document discusses the working principle of a DC motor. It begins by introducing DC motors and stating that they convert DC electrical energy to mechanical energy. It then explains the basic components of a DC motor and how current flowing through the armature in a magnetic field produces torque, causing the motor to rotate. It details Fleming's left hand rule for determining the direction of rotation. The document also discusses how back EMF is produced and how it allows the motor to maintain constant speed under varying loads.
This document discusses DC generators and motors. It begins by explaining how a rotating loop of wire in a magnetic field produces an alternating current (AC). It then describes how using split rings and brushes converts this to direct current (DC) in a generator. The key parts of a DC generator are identified as the stator, rotor and commutator. Expressions are given for the generated voltage in terms of machine parameters like speed, flux and number of turns. Different methods of field excitation like shunt, series and compound connections are explained. The buildup process of a self-excited shunt generator is described. External characteristics graphs of voltage versus current are shown for separately and shunt excited generators.
The document contains examples and problems about a simple rotating loop electrical machine. Example 1 part (a) asks what happens when a switch connecting the machine to a battery is closed. Parts (b) through (e) calculate machine parameters like starting current, speed, and power under different load and operating conditions. Problem 1 provides additional machine specifications and asks questions about whether it is operating as a motor or generator, and how current and power output would change with different rotor speeds.
Emc510 s emec_lect_notes_sem-1_2016_lecture-2Timoteus Ikaku
(1) The document discusses the principles of electro-mechanical energy conversion in machines. It describes how an electromagnetic machine provides a reversible means of energy flow between an electrical energy system and another system, usually mechanical, through a magnetic field.
(2) The energy conversion process involves the magnetic field temporarily storing energy transferred from one system to the other before releasing it to the other system. Motors convert electrical to mechanical energy while generators do the reverse.
(3) Electromagnetic machines can develop mechanical force in two ways: through alignment which acts to minimize magnetic reluctance, or through interaction between magnetic fields produced by current and magnets.
1) Electromechanical energy conversion theory represents electromagnetic force or torque in terms of device variables like currents and mechanical displacement.
2) An electromechanical system consists of an electric system, mechanical system, and means for them to interact via a coupling field.
3) The total energy supplied to the coupling field equals the energy transferred from the electric system plus the energy transferred from the mechanical system.
The document discusses electromechanical energy conversion in systems consisting of electric and mechanical components coupled through an interaction field. It presents equations showing that the total energy transferred to the coupling field (WF) is equal to the energy supplied by the electric system (WE) plus the energy supplied by the mechanical system (WM). The energy transfer is also affected by losses in the electric, mechanical and coupling field components. It further derives an expression for the electromagnetic force (fe) in terms of the device variables like current (i) and displacement (x).
This document discusses alternating current (AC) circuits. It begins by describing how an alternating electromotive force (EMF) is generated using a coil rotating in a magnetic field. Equations are provided showing that both the induced EMF and current vary as sine functions. Common terms used in AC circuits like cycle, frequency, phase, and root mean square (RMS) value are defined. Phasor diagrams are introduced to represent AC quantities in terms of magnitude and direction. Derivations of average and RMS values are shown. Finally, a purely resistive AC circuit is analyzed, showing the current is in phase with voltage and both follow sine waves. Power calculations are also demonstrated.
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 https://ekeeda.com/streamdetails/stream/Electrical-Engineering
This document provides an introduction and overview of alternating current (AC) circuits. It discusses various topics including:
1) AC waveforms such as sinusoidal waves and their advantages over other waveforms.
2) How alternating voltage and current are generated using devices like alternators that rotate a coil in a magnetic field.
3) Key concepts in AC circuits like phase, phase difference, RMS and average values, and phasor representation.
4) How AC behaves when passing through circuit elements like resistors, inductors, and capacitors.
The document contains explanations, diagrams and equations related to these fundamental AC circuit concepts.
This document provides an introduction and overview of alternating current (AC) circuits. It discusses various topics including:
1) AC waveforms such as sinusoidal waves and their advantages over other waveforms.
2) How alternating voltage and current are generated using devices like alternators that rotate a coil in a magnetic field.
3) Key concepts in AC circuits like phase, phase difference, RMS and average values, and phasor representation.
4) How AC behaves when passing through circuit elements like resistors, inductors, and capacitors.
The document contains explanations, diagrams and equations related to these fundamental AC circuit analysis topics.
This document discusses single-phase AC circuits and alternating quantities. It defines key terms like cycle, time period, frequency, phase, and phase difference. It also describes how an alternating electromotive force (EMF) is generated by rotating a coil within a magnetic field, producing a sinusoidal waveform. The maximum and instantaneous values of the generated EMF are defined in terms of the magnetic field strength, coil dimensions, number of turns, rotational speed, and angular position of the coil. An example calculation is provided to illustrate these relationships.
A numerical problem wherein the total inductance of an electromechanical energy conversion device is calculated furthermore the effect of changing the airgap length on the static force is also observed
This document provides information about the BE8255 – Basic Electrical Electronics and Measurement Engineering course at JNN Institute of Engineering. It outlines the course objectives, which include explaining basic theorems in electrical circuits, components and functions of electrical machines, fundamentals of semiconductors and applications, principles of digital electronics, and imparting knowledge of communication. It lists the textbook and references for the course and provides details about the topics that will be covered, including DC and AC rotating machines, electrical machines, single phase induction motors, and transformers.
This document contains solutions to physics problems from the 12th CBSE exam. It discusses topics like Lenz's law, electric fields, the photoelectric effect, atomic spectra of hydrogen, rectifiers, and more. The solutions are presented in point form and range from short explanations to longer derivations. Overall, the document provides concise answers and working steps to multiple conceptual and numerical problems in 12th grade physics.
This document contains physics examination papers from 2008-2012 administered by the Central Board of Secondary Education (CBSE) in Delhi, India. It lists the contents which include CBSE examination papers from Delhi and All India in those years, as well as foreign papers. A sample paper from the 2008 Delhi exam is then provided, consisting of 30 multiple choice questions testing concepts in physics.
James Clerk Maxwell's equations represent the fundamentals of electricity and magnetism in an elegant and concise form. The document discusses various units used to measure magnetic flux, such as the Maxwell and Weber. It then examines Maxwell's modifications to Ampere's law by including the concept of displacement current to account for changing electric fields producing magnetic fields. As an example, the document calculates the magnetic field produced near a parallel plate capacitor due to the changing electric field between its plates.
Research on Transformer Core Vibration under DC Bias Based on Multi-field Cou...inventionjournals
The Mathematical models for DC bias vibration analysis of the transformer core are developed in this paper. The model is combined into multi-physical field coupling modeling for vibration analysis of the transformer. By applying the primary voltage as excitation and under different DC bias, vibrations of the transformer core is simulated and analyzed.
This document provides information on the design of single phase and three phase variable air-gap choke coils. It discusses the key components of a choke coil including the copper wire winding and laminated iron core. The design procedure involves determining the required magnetic flux, current, turns, conductor size, and mechanical dimensions. Key steps include calculating the ampere-turns for the iron and air gaps, selecting the conductor size based on current density, and determining the coil window size and spacing to accommodate the windings. Design values such as resistance, inductance, and impedance are also calculated.
Incomplete PPT on first topic.pptx [Autosaved] [Autosaved].pptShubhobrataRudr
The document provides information on rotating electrical machines. It discusses the basic concepts of electromechanical energy conversion that occurs due to changes in flux linkages resulting from mechanical motion. It describes different types of machine windings including armature, field, AC, and distributed windings. The document also covers the generation of a rotating magnetic field in a three-phase system using three coils with currents that are equal in magnitude and phase-displaced by 120 degrees, resulting in a constant magnitude rotating magnetic field. It derives expressions for the induced voltages in coils and discusses factors that affect the induced voltages.
1) The chapter discusses electromagnetic induction, including induced electromotive force (emf) in coils due to changing magnetic fields. Several examples are worked out calculating induced emf in coils undergoing various changes in magnetic flux.
2) Generators are also discussed, including the factors that determine the maximum emf generated by coils rotating in magnetic fields. Examples calculate the rotation speed required to produce a given maximum emf.
3) The concept of back emf in DC motors is introduced, along with an example calculating the back emf and starting current of a motor operating at 120V.
The document discusses direct current (DC) machines and their operation. It provides details on:
1) The basic components and construction of a DC machine including its armature winding, commutator, and field poles.
2) How an alternating current induced in the armature coils is converted to direct current via the commutator and brush assembly.
3) Different types of armature windings including lap and wave windings.
4) Factors that affect the performance of DC machines such as armature reaction and how it can be mitigated through techniques like using interpoles.
5) Equations for calculating the generated electromotive force (EMF) in a DC generator.
Concept of general terms pertaining to rotating machinesvishalgohel12195
This document discusses concepts related to rotating machines including:
1. Physical concepts of force and torque production in rotating machines and general terms like generated EMF in full pitched and short pitched windings.
2. Definitions of terms like conductor, overhang, coil, pole pitch, coil span, full pitched and short pitched coils.
3. Advantages of using short pitched coils like reduced overhang and copper, lower distortions harmonics, reduced eddy current and hysteresis losses, and increased efficiency.
4. Disadvantage of short pitched coils is their total voltage is somewhat reduced due to voltages induced on two sides being slightly out of phase.
Rotating magnetic fields are produced by supplying a three-phase winding with alternating current such that the current in each phase is 120 degrees out of phase. This produces three magnetic fluxes that are 120 degrees out of phase. The vector sum of these three fluxes results in a single magnetic flux vector that rotates in space. This rotating magnetic field can be used to drive an electric motor or generator. The speed of rotation is proportional to the supply frequency and number of poles, such that for a 2-pole winding, the magnetic field rotates at half the frequency of the alternating current supply.
Electrical System Design transformer 4.pptxGulAhmad16
The document discusses the design of transformers, including their construction types (core type and shell type) and key differences. It also covers the output equations for single phase and three phase transformers, which relate the kVA output to factors like the core area, window space, current density, and number of turns. The equations show that kVA output is directly proportional to factors like frequency, flux, and the product of core area and window space. The document also mentions the ratio of specific magnetic to electric loading (r) used in transformer design and provides typical r values for different transformer types.
This document provides an instructional module on AC Machinery that covers alternators, synchronous motors, induction motors, and single-phase motors. It begins with an introduction and preface, then provides a table of contents outlining the key topics covered in each of the 4 chapters. The chapters cover the theory, principles of operation, engineering aspects, and applications of each type of AC motor. The objective is to impart the theories and principles of alternating current and electrical machines to students.
The document provides an overview of key concepts in electrical power engineering. It defines common units used to measure electrical quantities and properties of materials. It also summarizes fundamentals of DC circuits, magnetic fields, electromagnetism, AC circuits, electrical machines including motors and generators, and power systems components. The summary defines important terms concisely and establishes the scope of topics covered in the full document.
ACEP Magazine edition 4th launched on 05.06.2024Rahul
This document provides information about the third edition of the magazine "Sthapatya" published by the Association of Civil Engineers (Practicing) Aurangabad. It includes messages from current and past presidents of ACEP, memories and photos from past ACEP events, information on life time achievement awards given by ACEP, and a technical article on concrete maintenance, repairs and strengthening. The document highlights activities of ACEP and provides a technical educational article for members.
Introduction- e - waste – definition - sources of e-waste– hazardous substances in e-waste - effects of e-waste on environment and human health- need for e-waste management– e-waste handling rules - waste minimization techniques for managing e-waste – recycling of e-waste - disposal treatment methods of e- waste – mechanism of extraction of precious metal from leaching solution-global Scenario of E-waste – E-waste in India- case studies.
6th International Conference on Machine Learning & Applications (CMLA 2024)ClaraZara1
6th International Conference on Machine Learning & Applications (CMLA 2024) will provide an excellent international forum for sharing knowledge and results in theory, methodology and applications of on Machine Learning & Applications.
A review on techniques and modelling methodologies used for checking electrom...nooriasukmaningtyas
The proper function of the integrated circuit (IC) in an inhibiting electromagnetic environment has always been a serious concern throughout the decades of revolution in the world of electronics, from disjunct devices to today’s integrated circuit technology, where billions of transistors are combined on a single chip. The automotive industry and smart vehicles in particular, are confronting design issues such as being prone to electromagnetic interference (EMI). Electronic control devices calculate incorrect outputs because of EMI and sensors give misleading values which can prove fatal in case of automotives. In this paper, the authors have non exhaustively tried to review research work concerned with the investigation of EMI in ICs and prediction of this EMI using various modelling methodologies and measurement setups.
Presentation of IEEE Slovenia CIS (Computational Intelligence Society) Chapte...University of Maribor
Slides from talk presenting:
Aleš Zamuda: Presentation of IEEE Slovenia CIS (Computational Intelligence Society) Chapter and Networking.
Presentation at IcETRAN 2024 session:
"Inter-Society Networking Panel GRSS/MTT-S/CIS
Panel Session: Promoting Connection and Cooperation"
IEEE Slovenia GRSS
IEEE Serbia and Montenegro MTT-S
IEEE Slovenia CIS
11TH INTERNATIONAL CONFERENCE ON ELECTRICAL, ELECTRONIC AND COMPUTING ENGINEERING
3-6 June 2024, Niš, Serbia
Harnessing WebAssembly for Real-time Stateless Streaming PipelinesChristina Lin
Traditionally, dealing with real-time data pipelines has involved significant overhead, even for straightforward tasks like data transformation or masking. However, in this talk, we’ll venture into the dynamic realm of WebAssembly (WASM) and discover how it can revolutionize the creation of stateless streaming pipelines within a Kafka (Redpanda) broker. These pipelines are adept at managing low-latency, high-data-volume scenarios.