Multiple choice

A DC voltmeter is capable of measuring a maximum of 300 volts. If it is used to measure the voltage across a device operating at 220-volts AC supply, the reading of the voltmeter will be- Which of these incidents caused alarm among the British rules?

  1. 300 volts

  2. 200 volts

  3. 110 volts

  4. 0 volts

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

A DC voltmeter measures the average value of a voltage signal. Since a standard AC supply is a symmetric sine wave, its average value over a cycle is zero, resulting in a zero reading on a DC meter.