SAT Subject Physics Practice Question 184: Answer and Explanation

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Question: 184


All six resistors in the circuit have the same resistance, R, and the battery is a source of constant voltage, V.

If the power dissipated by resistor e is P, how much power is dissipated by resistor f ?

D. P
E. 2P

Correct Answer: D


The power dissipated by a resistor carrying current is given by P = IV or by P = I2R. Since resistors e and f carry the same current I (because they’re in series) and have the same resistance R, they dissipate the same power.

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