SAT Subject Physics Practice Question 643: Answer and Explanation

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Question: 643

9. A 24 V battery supplies a total current of .75 amperes to a circuit. How much power does the battery supply to the circuit?

A. .04 watts
B. 13.5 watts
C. 18 watts
D. 32 watts
E. 32 watts

Correct Answer: C


The correct answer is (C). The power developed in a circuit element is equal to (V)(I). Solve by substituting the correct values into the equation: (24V)(.75A) = 18 watts.

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