Question

Certain heavy industrial equipment uses AC power that has a peak voltage of 679 V. What is the rms voltage?

a) 679 V
b) 339.5 V
c) 481 V
d) 480 V

Answer 1

The rms voltage of an AC power supply with a peak voltage of 679 V is approximately 480 V. This is found by dividing the peak voltage by the square root of two.

Step-by-step explanation:

The rms voltage for an AC power supply is the DC equivalent voltage that would deliver the same power to a resistor as the AC voltage does over a complete cycle. It's calculated by dividing the peak voltage by the square root of two. Since the given peak voltage is 679 V, the rms voltage would be 679 V divided by √2.

RMS Voltage = Peak Voltage / √2

RMS Voltage = 679 V / 1.414

RMS Voltage = 480 V (approximately)