2-14-08Lec12

# 2-14-08Lec12 - Lecture 12-1 Using Kirchhoff's Laws in...

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Lecture 12 Lecture 12 - 1 Using Kirchhoff’s Laws in Multiple Loop Circuits • Identify nodes and use Junction Rule: 3 1 2 i i i = + • Identify independent loops and use Loop Rule: Only two are independent. 1 1 1 2 2 2 1 1 0 i R i R i R ε ε + + = ( ) ( ) 2 1 2 1 2 2 2 1 2 1 0 i i R i R i i R ε ε + + = ( ) ( ) 2 1 2 1 1 1 1 1 1 1 2 1 0 i i R i R i R i i R ε ε + + = 1 2 i i + 1 2 i i +

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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 and indicates its magnitude. Its own resistance R g is small for not disturbing what is being measured.

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