SAT Subject Physics Practice Question 85: Answer and Explanation

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Question: 85

3. If a 60-watt lightbulb operates at a voltage of 120 V, what is the resistance of the bulb?

A. 2Ω
B. 30Ω
C. 240Ω
D. 720Ω
E. 7,200Ω

Correct Answer: C

Explanation:

Use the equation P = .

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