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The AC mains domestic supply current in India changes direction in

June 1, 2025 by rawan239

The AC mains domestic supply current in India changes direction in every

50 s

$rac{1}{50}$ s

100 s

$rac{1}{100}$ s

This question was previously asked in

UPSC NDA-2 – 2024

Download PDF Attempt Online

The standard frequency of AC mains supply in India is 50 Hz. The frequency (f) is the number of complete cycles per second. The time period (T) of one complete cycle is given by T = 1/f. For f = 50 Hz, T = 1/50 s. In one complete cycle of alternating current, the current starts from zero, reaches a maximum in one direction, passes through zero, reaches a maximum in the opposite direction, and returns to zero. The current changes direction twice within one complete cycle (at the points where it crosses the zero line). Thus, the time taken for the current to change direction is half the time period. Time for direction change = T/2 = (1/50 s) / 2 = 1/100 s.

The frequency of AC supply is the number of cycles per second. The time period is the duration of one cycle (T = 1/f). AC current changes direction twice in every complete cycle.

In many other countries, such as the USA, the standard AC mains frequency is 60 Hz. In a 60 Hz system, the current changes direction every 1/120 s.

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