2-14-08Lec12

2-14-08Lec12 - Lecture 12 Lecture 12-1 Using Kirchhoff’s...

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Unformatted text preview: Lecture 12 Lecture 12-1 Using Kirchhoff’s Laws in Multiple Loop Circuits •Identify nodes and use Junction Rule: 3 1 2 i ii =+ •Identify independent loops and use Loop Rule: Only two are independent. 1 11 2 2 2 11 iR iR iR ε ε + − − + = ( ) ( ) 2 1 2 1 2 2 2 1 2 1 ii R iR ii R ε ε − + − − − + = ( ) ( ) 2 1 2 1 11 1 11 1 2 1 iiR iR iR iiR ε ε − + − − − − + = 1 2 ii + 1 2 ii + Lecture 12 Lecture 12-2 Ammeter and Voltmeter Ammeter : an instrument used to measure currents •It must be connected in series. •The internal resistance of an ammeter must be kept as small as possible. Voltmeter : an instrument used to measure potential differences •It must be connected in parallel. •The internal resistance of a voltmeter must be made as large as possible. Lecture 12 Lecture 12-3 Galvanometer Inside Ammeter and Voltmeter Ammeter : an instrument used to measure currents Voltmeter : an instrument used to measure potential differences galvanometer shunt resistor galvanometer Galvanometer: a device that detects small currents...
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This note was uploaded on 04/07/2008 for the course PHYS 241 taught by Professor Wei during the Spring '08 term at Purdue.

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2-14-08Lec12 - Lecture 12 Lecture 12-1 Using Kirchhoff’s...

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