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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 volt AC supply, the reading of the voltmeter will be
  • a)
    0 volt
  • b)
    330 volts
  • c)
    110 volts
  • d)
    220 volts
Correct answer is option 'A'. Can you explain this answer?
Verified Answer
A DC voltmeter is capable of measuring a maximum of 300 volts. If it i...
  • DC voltmeter can not measure AC voltages.
  • When used in AC circuits, DC Voltmeter gives zero reading because the average value of alternating voltage over a full cycle is zero.
  • So, the reading of the voltmeter will be 0 volts, as a DC voltmeter cannot be used for measuring AC potential difference as it is current direction oriented.
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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 volt AC supply, the reading of the voltmeter will bea)0 voltb)330 voltsc)110 voltsd)220 voltsCorrect answer is option 'A'. Can you explain this answer?
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