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A DC ammeter cannot measure alternating ...

A `DC` ammeter cannot measure alternating current because

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No, it is based on the principle of torque. When ac is passing through it (of freq. 50 Hz). It will not respond to frequent change in direction due to inertia hence would show zero deflection.
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Can we use galvanometer to measure alternating current ?

An ac ammeter is used to measure currnet in a circuit. When a given direct current passes through the circuit. The ac ammeter reads 3 A. When another alternating current passes through the circuit, the ac ammeter reads 4A. Then find the reading of this ammeter (inA), if dc and ac flow through the circuit simultaneously.

Knowledge Check

  • Alternating current can be measured by

    A
    moving coil galvanometer
    B
    hot wire ammeter
    C
    tangent galvanometer
    D
    none of these

  • Alternating current can be measured by

    A
    moving coil galvanometer
    B
    hot wire ammeter
    C
    tangent galvanometer
    D
    none of the above

  • We cannot use a D.C. Voltmeter to measure an alternating voltage because,

    A
    the alternating voltage changes direction
    B
    A.C. cannot pass thorugh the D.C. voltmeter
    C
    The average value of an alternating emf over a complete is zero, Hence D.C. Voltmeter will not show any deflection
    D
    As the pointer showing the reading of the voltmeter is deflected 50 times per second, it is damaged

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    An AC ammeter is used to measure current in a circuit. When a direct cument (DC) passes through the circuit, the AG ammeter reads 3 A . When altemating current AC passes through the circuit, the AC ammeter reads 4 A. The reading of this armeter (in ampere) if DC and AC flow through the circuit simulteneously, is .

    ……………….. Instrument is used for the measurement of alternating current .

    Instrument which measures alternating current is based on

    A : The ammeters and volmetrs used for measuring alternating current and voltages have non-uniform divisons on their scales. R : The instruments used for measuring alternating current and voltage are based on heating effect of current.

    A : If a current has both ac and dc components, then a dc ammeter used to measure this current will measure the average value of the total current. R : The scale of a dc ammeter is uniformly divided.

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