DC circuits - PHY 2049C General Physics B Fields, Circuits,...

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PHY 2049C – General Physics B Fields, Circuits, Waves, Light Today: 1) R: Parallel and Series 2) Complex Circuits 3) RC-circuits
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Two Bulbs (Resistors) in Series Same current in all parts: How much ? The total current will be less than for one bulb ! R 1 R 2 Current I Current I V B V 1 V 2 V B 11 2 2 12 1 2 1 2 () Be q u i v VI R V I R VV R I RI R R I R == =+ = + = + =
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Question The circuit below consists of two identical light bulbs burning with equal brightness and a single 12 V battery. When the switch is closed, the brightness of bulb A 1. increases. 2. remains unchanged. 3. decreases.
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Two Bulbs (Resistors) in Parallel Both bulbs see the same voltage , but may carry a different current . What is the total current ? The total current will be more than for one bulb ! R 1 R 2 V B V B 12 11 1 () BB equiv VV II I V V RR R =+ = + = + =
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Resistance: Parallel and Series Parallel branches: Currents add up I 1 + I 2 = I Voltage is the same Series connection: Voltages add up V 1 +V 2 = V B Current is the same R 1 R 2 V B V 1 V 2 V B R 1 R 2 Current I V B V B I 1 I 2 I 1 I 2 123 11 1 1 1 ... equiv N RR R R R =+ ++ + ... equiv N R R R +
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Question As more identical resistors, R , are added to the parallel circuit shown here, the total resistance between points P and Q 1. increases 2. decreases 3. stays the same
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Parallel and Series: Summary Resistors in parallel : Resistors in series : Capacitors in parallel : Capacitors in series : 12 RR R = + 11 1 R =+ CC C = + 1 C
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Kirchhoff's Rules 1: Junctions At any junction point , the sum of all currents entering the junction must equal the sum of all currents leaving the junction.
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This note was uploaded on 06/29/2010 for the course PHY2049C PHY2049C taught by Professor Duke during the Summer '10 term at FSU.

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DC circuits - PHY 2049C General Physics B Fields, Circuits,...

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