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Measurements and Instrumentation - Engineering

Q1:

A resistance is measured by voltmeter-ammeter method. The voltmeter is 0-250V, ± 1% accuracy and ammeter is 0-5 A, ± 1 % accuracy. The readings of voltmeter and ammeter are 100 V and 2 A respectively. The error in the measured resistance can be

A ± 1%

B ± 2%

C ± 5%

D ± 10%

ANS:C - ± 5%

Error in voltmeter can be ± 2.5 V which for 100 V reading is ± 2.5 % . Error in ammeter can be ± 0.05 A which for 2 A reading is ± 2.5 %. Hence total error can be ± 5%.