What would you suggest to a student if while performing an experiment he finds that the pointer/needle of the ammeter and voltmeter do not coincide with the zero marks on the scales when the circuit is open? No extra ammeter/voltmeter is available in the laboratory.

Pointer/needle of the ammeter and voltmeter do not coincide with the zero marks on the scales when the circuit is open, then this is called the zero error of the scale of ammeter or voltmeter.

If there is a zero error, then we suggest subtracting this error from the value that depicts when the circuit is closed (or, subtract the value of reading shown by ammeter from the value he gets after passing the current), otherwise, the accurate current or potential difference will not be recorded.

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Updated on: 10-Oct-2022

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