The voltage across any two power lines of a three phase alternating current supply is
Correct answer: B. 400 V
- A. 220 V
- B. 400 V
- C. 440 V
- D. 1100 V
Explanation
In a three-phase alternating current supply, the voltage across any two power lines is typically 400 V. This is the standard voltage for industrial and commercial three-phase systems. Option A (220 V) is incorrect because it is a common voltage for single-phase systems. Option C (440 V) is close, but not the standard voltage. Option D (1100 V) is too high for a standard three-phase system.
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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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