Q. 274.5( 6 Votes )
A galvanometer co
Resistance of the galvanometer coil, G = 12Ω
Current for full scale deflection = 3mA
For converting a galvanometer into a Voltmeter we can connect a resistance in series with the galvanometer. A minimum value of current should be allowed to flow through the voltmeter.
Required range of the voltmeter = 0 to 18 V
V = 18
Let the resistance needed = Rs
By plugging the values of V, G and Is in equation 1, we get,
⇒ Rs = 5988 Ω
For converting the galvanometer into a voltmeter of range 0-18 we can add a resistance of 5988Ω, is series with the galvanometer.
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