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Discussion :: Measurements and Instrumentation

  1. 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

    2. A.
    ± 1%
    B.
    ± 2%
    C.
    ± 5%
    D.
    ± 10%

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    Answer : Option C

    Explanation :

    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%.

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