Question

A galvanometer coil of 50 ohm resistance shows full scale deflection for a current of 5ma. How will you cpnvert this galvanometer into a voltmeter of range 0 to 15 v

Answer 1

you have to connect a resistor of 2950 ohm in series with Galvanometer.

Answer 2

For conversion into volmeter, 2950 ohm resistance should be in series with galvanometer.

Explanation:

Given the galvanometer resistance of the coil, R = 50 ohm.

The deflection current, I_g = 5 mA = 0.005 A.

The maximum voltage , V = 15 V.

For conversion into voltmeter, R resistor should  be combined in series with  galvanometer.

$R=\frac{V}{I_g}-G$

Substitute the values, we get

$R=\frac{15V}{5\times10^-^3A} -50\Omega$

$R=3000\Omega-50\Omega$

R= 2950 ohm.

Thus, 2950 ohm resistance should be added in series with galvanometer.

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