The phase at negative peak of AC voltage is:
Correct answer: C. 3π/2
- A. π/2
- B. π
- C. 3π/2
- D. 2π/3
Explanation
Given the AC voltage is in the form of a sinusoidal wave starting from 0, the positive peak is at π/2 and thus the negative peak is at 3π/2. The AC voltage is in the form of a sinusoidal wave shown below. 270°/ 3π/2 rad is the negative peak as indicated. Option C is correct.
This question appeared on the UHS MDCAT 2017 paper, which you can sit online with every answer explained.
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About Phase of Alternating Current
Phase describes the position of an alternating voltage or current within its cycle and the phase difference between two sinusoidal quantities. The topic covers in phase signals, phase angle and lead or lag in resistive, inductive and capacitive circuits, rather than the amplitude or frequency of the supply.
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