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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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