A 100 V Voltmeter has an accuracy of 5% on the full scale. The percentage error while measuring 50 V will be

A 100 V Voltmeter has an accuracy of 5% on the full scale. The percentage error while measuring 50 V will be

Right Answer is:

10%

SOLUTION

Limiting error at full scale is

δE = ± 5% of 100

δE = ±5mv

Thus when the reading is 50 V, the error will still be 5 V. Hence the % limiting error

= (5/50)x100 = 10%

Note that the percentage limiting error is twice the mentioned value at full-scale reading. The limiting error increases as the reading of the voltmeter decrease.

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