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Question

The current in a conductor and the potential difference across its ends are measured by an ammeter and a voltmeter. The meters draw negligible currents. The ammeter is accurate but the voltmeter has a zero error (that is, it does not read zero when no potential difference is applied). Calculate the zero error if the readings for two different conditions are 1.75 A,14.4 V and 2.75 A,22.4 V.

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Solution

Let the voltmeter reading when, the voltage is 0 be V.
l1Rl2R=V1V2

1.752.75=14.4V22.4V0.350.55=14.4V22.4V

0.070.11=14.4V22.4V711=14.4V22.4V

7(22.4V)=11(14.4V)156.87V=158.411V

(711)V=156.8158.44V=1.6

V=0.4V

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