# Electric Circuits containing resistors. Circuits Charges travel in a circuit to maintain charge balance.

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Electric Circuits containing resistors

Circuits Charges travel in a circuit to maintain charge balance

Group Work Light the bulb!

Light Bulb Anatomy

Resistance Current does not flow unhindered Electrical resistance is analogous to friction or drag Expressed as potential needed to maintain a current

Circuit Diagrams resistor Potential source

Question: Series Circuit Circuit resistance is A. More than with one bulb. B. Less than with one bulb. C. The same as with one bulb. R1R1 R2R2 R3R3

Series Circuit Circuit resistance = R 1 + R 2 + R 3 R1R1 R2R2 R3R3

Series Summary The same current flows through all resistors in series. The series resistance is the sum of the resistors’ resistances. The resistors’ voltage drops add up to the series total. The voltage drop across a resistor is proportional to its resistance.

Question: Parallel Circuit Circuit resistance is A. More than with one bulb. B. Less than with one bulb. C. The same as with one bulb.

Parallel Circuit Diagram

Potential Differences

Currents Total current = I = I 1 + I 2 + I 3 = V/R 1 + V/R 2 + V/R 3 Circuit resistance =V/ I = 1/R 1 + 1/R 2 + 1/R 3 1

Parallel Summary The same voltage drops across all resistors in parallel. The series current is the sum of the resistors’ currents. The effective resistance is less than for any individual resistor. Formula is R =

Series and Parallel Circuit Circuit resistance = R 1 + 1/R 2 + 1/R 3 1

Group Work Determine current direction, current, voltage, and power dissipated for each resistor. 12  6  9  18  9  8  10  3  18  9 

Group Work 4.Determine the power for each resistor. 12  6  9  18  9  8  10  3  18  9 

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