Which of the following is a characteristic of DC power?
A. Polarity is fixed.
B. Voltage varies during cycles.
C. It is difficult to measure.
D. Voltage can be stepped up or down by a transformer.
A. Correct. Polarity is fixed with DC power.
B. Incorrect. Polarity is fixed with DC power.
C. Incorrect. Polarity is fixed with DC power.
D. Incorrect. Polarity is fixed with DC power.
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