Which of the following is a characteristic of AC power?
A) Polarity is fixed
B) Voltage remains constant
C) Heating effect is less than DC
D) It can be varied for power distribution
Answer: D
Explanation: A) Incorrect. Polarity is switched constantly with AC power.
B) Incorrect. Voltage varies during cycles with AC power.
C) Incorrect. Heating effect is the same as DC power.
D) Correct. AC power can be varied for power distribution.
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