14 - Circuits II

# 14 - Circuits II - Phys212 Fall 2009 Circuits II Solving...

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Phys212 Fall 2009 Circuits II - 9/25/09

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Solving Circuits Potential Method - Rules - Kirchhoff’s Junction Rule - sum of currents into a junction equals the sums of the currents out of a junction Kirchhoff’s Loop Rule -The algebraic sum of the changes in potential around a closed loop must equal zero. Resistance Rule - For a move through a resistor (R) in the direction of the current (i), the change in potential is -iR; in the opposite direction it is iR. EMF Rule - For a move through an EMF device in the direction - to +, the change in potential is + E; in the opposite direction it is - E Current Direction - current ±ows in the direction that positive charge carriers move
Two Bulbs Consider the circuit shown in the drawing. Two identical light bulbs, labeled A and B, are connected in series with a battery and are illuminated equally. There is a switch in the circuit that is initially open. Which one of the following statements concerning the two bulbs is true after the switch is closed? a) Bulbs A and B will be off. b) Bulbs A and B will be equally illuminated. c) Bulb A will be brighter and bulb B will be off. d) Bulb A will be off and bulb B will be brighter. e) Both bulbs will be dimmer than before the switch was closed.

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Parallel Resistors In the circuit below, what is the current through R 1 ?
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14 - Circuits II - Phys212 Fall 2009 Circuits II Solving...

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