alleryStart learning →Heavy industrial equipment runs on AC with a peak voltage of 679 V. What is the rms voltage?
A679 V
B960 V
C480 V
D340 V
Answer & Solution
Correct answer: C. 480 V
1. Use V_rms = V_0 divided by the square root of two.
2. Substitute the peak value: V_rms = 679 V / 1.414.
3. That gives V_rms = 480 V, a standard industrial supply figure.
4. 960 V is the trap of multiplying by 1.414 rather than dividing.
5. 340 V would follow from halving the peak, which is not what the root two factor does.
_Source: OpenStax College Physics (CC BY 4.0), Ch 20 "Electric Current, Resistance, and Ohm's Law", section Alternating Current_
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