Question

The value used for practical measurement of Alternating Current is the:

Options

• RMS (root mean square) value

• Simple average value

• Peak-to-peak value only

• Instantaneous maximum value only

Answer 1

For DC, a simple average is used for measurement, but for AC, the RMS (root mean square) value is used for practical measurement. This is because AC varies sinusoidally, so its average over a cycle alone does not represent its effective value.