MCAT Question A Day - 3/27/14 - Answer!

What is the current in a 60-W light bulb operating at 120-V household voltage?

A. 2.0 A

B. 1.5 A

C. 1.0 A

D. 0.5 A

The correct answer is (D). 60 W represents the power usage of the bulb. Power is the product of current and voltage. Thus,

I = P/V = 60W / 120V = 0.5A

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