Question 192Electricity & Electronics - Assistant Engineer

The correct answer is D) unity. When the voltage and current in an AC circuit reach their peak values at the same time, it indicates that the circuit has a phase angle difference of zero degrees. This means the power factor of the circuit is unity (1.0), as the voltage and current are in phase and there is no phase displacement between them. The other options are incorrect because: A) lagging indicates a phase angle difference between 0 and 90 degrees, which is not the case here; B) infinity is not a valid power factor value; and C) leading indicates a phase angle difference between 0 and -90 degrees, which is also not the case.