If the peak voltage of an AC supply is 311 V, its rms value is about
- A. 440 V
- B. 220 V
- C. 311 V
- D. 155 V
Explanation
Dividing 311 by the square root of 2, that is by about 1.414, gives roughly 220 V, the standard supply voltage in Pakistan. Multiplying instead gives the 440 V distractor. Half the peak, 155 V, has no physical significance here.
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