How often does the AC power supply change direction in the United States?
A. 10 times per second
B. 30 times per second
C. 60 times per second
D. 90 times per second
A. Incorrect. In the United States, the AC power supply changes direction 60 times per second.
B. Incorrect. In the United States, the AC power supply changes direction 60 times per second.
C. Correct. In the United States, the AC power supply changes direction 60 times per second.
D. Incorrect. In the United States, the AC power supply changes direction 60 times per second.
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