Question
Download Solution PDFA 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
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFCONCEPT:
- Voltmeter: The device that is used to measure the electrical potential difference between two points in an electric circuit is called a voltmeter.
- The voltmeter is connected in parallel with the circuit to measure the same voltage drop occurs across it.
Based on the measurement, Voltmeter is of two types:
- DC Voltmeter
- AC Voltmeter
- To measure DC voltage, a DC voltmeter is used.
- To measure AC voltage, an AC voltmeter or hot wire voltmeter is used.
EXPLANATION:
- 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.
- To measure AC, the heating effect of the current is used because the heating effect does not depend on the direction of the flow of current.
- The hot wire Voltmeter or AC voltmeter works in the principle of heating effect.
- It measures the RMS value of voltage in AC.
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