3_SeriesParallel - Electrical Circuits Two types: Series...

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1 Electrical Circuits Two types: Series Only one path Parallel Branching points Series Circuits Current flows through every part of the circuit If one bulb is out, all are out! Series Circuits Current is the SAME at all points!! Amount of current determined by using Ohm’s Law. What did you find out about series resistance? How to find the current in a series circuit Total resistance = sum of all resistors. R T = R 1 + R 2 + R 3 + … Use total resistance in Ohm’s Law: I = V/R
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2 Example How much current is in a circuit with a 1.5 volt battery and three 1 Ω resistances (bulbs) in series? • R T = 1 Ω + 1 Ω + 1 Ω = 3 Ω • I = V/R • V = 1.5 volts R = 3 Ω • I = 1.5 volts / 3 Ω • I = .5 amps Voltage in a series circuit Current across each resistor is the same!! Voltage is divided among resistors – must add up to battery’s voltage. Use Ohm’s Law to determine voltage on each. Parallel Circuit
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This note was uploaded on 11/13/2011 for the course PHYS 1111 taught by Professor Plascak during the Fall '08 term at University of Georgia Athens.

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3_SeriesParallel - Electrical Circuits Two types: Series...

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