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Discussion :: Measurements and Instrumentation

  1. An ammeter has a resistance of 50 ohms and a shunt of 0.01 Ω. The deflection is θ. If the shunt resistance is increased to 0.02 Ω, the deflection will be.

    2. A.
    θ
    B.
    2θ
    C.
    0.5θ
    D.
    0.25θ

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    Answer : Option B

    Explanation :

    Since shunt resistance is doubled, current through ammeter is doubled (current division for resistances in parallel). Therefore reading is 2 θ.

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