Answer :



Ammeter reading of current, i1 in the 1st case=1.75A

Ammeter reading of current, i2 in the 2nd case=2.75A

Voltmeter reading for current i1, V1=14.4V

Voltmeter reading for current i2, V2=22.4V

Formula used

The ammeter shows the accurate reading while the voltmeter deviate from showing the corresponding potential difference value due to the presence of Zero error, Ve.

Hence the original potential difference can be calculated as, Vo

Where V is the shown voltage in the defected voltmeter.

We also know that the potential difference across the conductor is, V

Where R is the resistance of the conductor


For the 1st and 2nd case, the relation between absolute current and voltage can be written, from eqn.2, as


By dividing these expressions, we get

The terms Vo1 and Vo2 in above equation can be replaced by eqn.1 as

By substituting the given values in the above expression, we get





Hence the zero error associated with the measurement is 0.4V.

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