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    zainezaine's Avatar
    zainezaine Posts: 1, Reputation: 1
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    #1

    May 13, 2010, 01:04 AM
    Galvanometer converted into voltmeter
    A galvanometer whose resistance is 50Ω deflects full scale for a potential difference 100mV across in terminals. How can it be converted into a voltmeter of 50V range
    eeseely's Avatar
    eeseely Posts: 100, Reputation: 3
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    #2

    May 13, 2010, 09:26 AM

    Based upon the meter's resistance being 50 ohms and the full-scale voltage equal 100mV, the full-scale current through the meter is 2 mA.

    To have a 50 volt range meter, place fixed resistors and a variable resistor (potentiometer) in series with the meter.

    The fixed resistors would be 22,000 and 2,000 ohms, respectively; I would use a 1,000 variable resistor, which may be used to determine full-scale deflection @ 50 volts.
    KISS's Avatar
    KISS Posts: 12,510, Reputation: 839
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    #3

    May 13, 2010, 03:09 PM

    I'll make this harder. Suppose that you didn't know R of the meter. Propose an experment to determine R?
    eeseely's Avatar
    eeseely Posts: 100, Reputation: 3
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    #4

    May 14, 2010, 05:11 AM

    Place an ammeter and a 50k variable resistor in series with the galvanometer. Then decrease the resistance until the galvanometer shows full-scale deflection. The ammeter would show the current at full-scale deflection.
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