Moderate
The power consumed in a circuit element will be least when the phase difference between the current and voltage is________?
Correct answer: B. 90°
- A. 180″
- B. 90°
- C. 60°
- D. 0°
Explanation
Average AC power is \(P=VI\cos\phi\); for a passive circuit it becomes zero at a 90° phase difference, so no power is consumed. A 180° difference would indicate power delivery rather than ordinary power consumption.
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