The frequency of the alternating mains supply in Pakistan is
Correct answer: A. 50 Hz
- A. 50 Hz
- B. 60 Hz
- C. 100 Hz
- D. 220 Hz
Explanation
Pakistan, like most of Asia and Europe, uses 50 Hz at 220 V, while North America uses 60 Hz at 110 V. A frequency of 50 Hz means the current reverses direction 100 times each second, since there are two reversals per cycle. The figure 220 belongs to the voltage rather than the frequency.
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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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