Maximum Power Transfer Theorem
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In electrical engineering, the maximum power transfer theorem states that, to obtain maximum external power from a source with a finite internal resistance, the resistance of the load must equal the resistance of the source as viewed from its output terminals.
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The First Year engineering course seems more like an extension of the subjects that students have learned in their 12th class. Subjects like Engineering Physics, Chemistry, and Mathematics, are incorporated into the curriculum. Students will learn about some of the engineering subjects in this first year, and these subjects are similar to all the branches. Everyone will learn some basics related to the other streams in their first year. Ekeeda offers Online First Year Engineering Courses for all the Subjects as per the Syllabus.
sodapdf-converted.pptx
Power transformers work by mutual induction between two windings without any direct electrical connection. An alternating current applied to the primary winding produces an alternating magnetic flux that links with the secondary winding. This induces an alternating voltage in the secondary winding due to Faraday's law of induction. The primary winding is connected to the power source and the secondary winding supplies power to the load. The transformation ratio is determined by the number of turns in each winding and determines whether the transformer steps up or steps down the voltage. Transformer losses include copper losses in the windings and magnetic (iron) losses in the core.
Wk 17 p1 wk 18-p6_24.1-24.4_alternating currents
This document discusses alternating current (AC). It describes the characteristics of AC including period, frequency, peak value and root-mean-square value. It also discusses how AC power is transmitted through transformers and rectified to direct current (DC) for applications. Key points covered include the rms and peak values of AC, mean power in a resistive load, representation of AC by equations, transformer principles and ratios, transmission of power at high voltages to reduce losses, and half-wave and full-wave rectification using diodes.
A
This summarizes a document describing a high voltage power supply that can operate under magnetic fields. The power supply uses a ceramic transformer that utilizes piezoelectric effect instead of a conventional magnetic transformer, allowing it to function in magnetic fields. The power supply was tested under a 1.5 tesla magnetic field with its performance remaining intact. It provides 1500-2500 volts to loads over 10 megohms with over 50% efficiency. Feedback controls and stabilizes the high voltage output.
Ohm's law
- Ohm's law describes the direct proportional relationship between current (I), voltage (V), and inverse proportional relationship to resistance (R) in an electrical circuit. I=V/R.
- Current is the flow of electric charge. Voltage is the potential energy that causes charge carriers to move. Resistance opposes the flow of current and is dependent on the material's structure.
- Ohm's law can be manipulated algebraically to solve for any of the three variables. It applies to linear or "ohmic" devices but not nonlinear devices like lamps that do not follow a straight-line relationship between current and voltage.
PPT. ON D.C.pptx
Direct current analysis involves defining electric current as the flow of electric charges through a closed circuit. Some effects of electric current include magnetic, thermal, chemical, and motor effects. Measuring instruments in electricity include voltmeters, ohmmeters, and potentiometers. Kirchoff's laws govern the analysis of electric circuits, with the first law concerning junctions and the second concerning closed loops. Factors that affect resistance include length, temperature, cross-sectional area, and material of the conductor.
thelectricity
Aishwarya Shah completed a multi-disciplinary project on electricity for class 10. The project covered definitions of electricity, electric current, potential difference, electromotive force, electric circuits and components, measuring current and voltage, Ohm's law, factors affecting resistance, and combinations of resistors. It also discussed the heating effect of electricity and its applications. The project explained key concepts through definitions, diagrams, equations, and examples. Aishwarya thanked her teacher for the opportunity and hoped the effort was appreciated.
Turkey hv
This document provides an overview of high voltage techniques. It defines key concepts like voltage, potential, alternating voltage, and direct voltage. It explains why high voltages over 1000V are needed, such as to transmit more power over long distances with lower losses. The document also discusses high voltage levels used in Turkey and Northern Cyprus. It covers insulation, withstand voltages, overvoltages, and the importance of insulation coordination in electrical networks.
Mesh and nodal
This document provides information on different electrical concepts including:
- Voltage, current, and resistance definitions.
- Electric power formula using voltage, current, energy, and time.
- Active and passive electronic components and their definitions.
- Ohm's law relating voltage, current, and resistance.
- Current and voltage division rules for circuits with parallel and series resistors.
- Ideal and non-ideal voltage and current sources and their characteristics.
- Examples of calculations using the concepts covered.
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Ekeeda - First Year Enginering - Basic Electrical Engineering
Ekeeda - First Year Enginering - Basic Electrical Engineering
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Maximum Power Transfer Theorem
- 1. MAXIMUM POWER TRANSFER THEOREM DEPARTMENT OF ELECTRICAL ENGINEERING YEAR: 2ND YEAR (3rd Semester)
- 2. CONTENTS • INTRODUCTION • MAXIMUM POWER TRANSFER THEOREM STATEMENT • PROOF OF MAXIMUM POWER TRANSFER THEOREM • CONDITION FOR MAXIMUM POWER TRANSFER • THE VALUE OF MAXIMUM POWER TRANSFER • PRACTICAL APPLICATION
- 3. INTRODUCTION • In any electric circuit, the electrical energy from the supply is delivered to the load where it is converted into a useful work. • Practically the entire supplied power will not present at load due to heating effect and other constraints in the network. • Therefore there exist a certain difference between join and delivering powers. • The load size always affects the amount of power transferred from the supply source that is any change in the load resistance result to change in power transfer in the load. Thus, the maximum power transfer theorem ensures the condition to transfer the maximum power to the load.
- 4. MAXIMUM POWER TRANSFER THEOREM STATEMENT • The maximum power transfer theorem states that in a linear, bilateral DC network, maximum power is delivered to the load when the load resistance is equal to the internal resistance of a source. If it is in an independent voltage source then its series resistance or if it is independent current source then its parallel resistance must equal to the load resistance RL to deliver maximum power to the load.
- 5. PROOF OF MAXIMUM POWER TRANSFER THEOREM Replace any two terminal linear network or circuit to the left side of variable load resistor having resistance of RL ohms with a Thevenin’s equivalent circuit. We know that Thevenin’s equivalent circuit resembles a practical voltage source. This concept is illustrated in following figures. The amount of power dissipated across the load resistor is- PL = I2 RL Substitute 𝐼 = Vth Rth + RL in the above equation PL = ( Vth Rth + RL )2 RL
- 6. CONDITION FOR MAXIMUM POWER TRANSFER For maximum or minimum, first derivative will be zero. So, differentiate Equation 1 with respect to RL and make it equal to zero. Therefore, the condition for maximum power dissipation across the load is RL = RTH That means, if the value of load resistance is equal to the value of source resistance i.e., Thevenin’s resistance, then the power dissipated across the load will be of maximum. value.
- 7. THE VALUE OF MAXIMUM POWER TRANSFER Substitute RL = RTH & PL= PL, MAX Therefore, the maximum amount of power transferred to the load is
- 8. PRACTICAL APPLICATION • Consider the practical example of a speaker with an impedance of 8 ohms is driven by audio amplifier with its internal impedance of 500 ohms. The Thevenin's equivalent circuit is also shown in the figure: • According to the maximum power transfer theorem the power is maximized at the load if the load impedance is 500 ohms. Or else internal resistance has to be changed to 8 ohms to achieve the condition however it is not possible for stop so it is an impedance mismatch condition and it can be overcome by using and Impedance Matching Transformer with its impedance transformation ratio of 500:8.