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Feb7note2 - PHYS142 Lecture 14 Direct Current Circuits...

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Direct Current Circuits • Chapter 28 All sections except 5 28.1 Electromotive Force 28.2 Resistors in Series and Parallel 28.3 Kirchhoff’s Rules 28.4 RC Circuits PHYS142 Lecture 14 1
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Aim is to analyze electric circuits Circuit elements include: Batteries Capacitors Resistors Inductors Diodes Transistors ……. 2
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Electromotive force (28.1) A device that transforms one type of energy to electrical energy is called a source of electromotive force or EMF . EMF is measured in Volts. Let’s consider a real EMF (battery). 3
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Internal Resistance and Terminal Voltage The aging of a battery, due to the consumption or corrosion of its electrodes and the breakdown of its electrolyte, results in a reduction in its output or terminal voltage . These losses can be represented by an internal resistance . r A B 4 A real battery can be represented by The voltage between A and B is the terminal voltage of the battery, V AB , and r is the internal resistance of the battery. is the EMF of the battery. For an ideal battery, r = 0 and = V AB .
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An external resistor, called the load resistor, with resistance R is connected to a real battery as shown. Power generated by the battery =
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This note was uploaded on 02/22/2011 for the course PHYS 142 taught by Professor Altounian during the Spring '07 term at McGill.

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Feb7note2 - PHYS142 Lecture 14 Direct Current Circuits...

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