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How is a galvanometer converted into a v...

How is a galvanometer converted into a voltmeter?

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The galvanometer can be converted into a voltmeter by connecting a high resistance in series with it.

The value of .R. to be connected series with galvanometer depends on the potential difference to be measured , `I underset(g)` is the current for which the galvanometer gives full scale deflection, & G the galvanometer resistance. In figure Potential difference across AB is `V=I underset(g)"(G+R)`
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Knowledge Check

  • A galvanometer coil has a resistance of 50 Omega and the meter shows full scale deflection for a current of 5 mA . This galvanometer is converted into voltmeter of range 0-20V by connecting

    A
    `3950Omega` in series with galvanometer
    B
    `40Omega` in series with galvanometer
    C
    `3950Omega` in parallel with galvanometer
    D
    `4050Omega` in parallel with galvanometer

  • A moving coil galvanometer is converted intoan meterby connecting

    A
    A high resistnace in series
    B
    A low resistance in series
    C
    A high resistance in parallel
    D
    A low resistance in parallel

  • The maximum current that can be measured by a galvanometer of resistance 40 is 10 mA. It is converted into a voltmeter that can read upto 50 V. The resistance to be connected in series with the galvanometer is ........ (in ohm)

    A
    2010
    B
    4050
    C
    5040
    D
    4960

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    How is galvanometer converted into an ammeter?

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    A galvanometer may be converted into ammeter or a voltmeter. Resistance of the device so obtained will be the largest in the case of

    A galvanometer having a coil of resistance 12 Ω gives full scale deflection for a current of 4 mA. How can it be converted into a voltmeter of range 0 to 24V.

    Explain giving reasons, the basic difference in converting a galvanometer into (i) a voltmeter and (ii) an ammeter.

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