The waveform of the voltage is sinusoidal and the waveform of the current lags behind it. With reference to the given statement, the CORRECT phase relationship between voltage and current is that
Correct answer: C. the voltage leads the current.
- A. they both become zero.
- B. they both become infinite.
- C. the voltage leads the current.
- D. the current leads the voltage.
Explanation
* The question explicitly states, "the waveform of the current lags behind it [voltage]." This directly means that the voltage is ahead of the current in its phase, or in other words, the voltage leads the current.
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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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