A certain galvanometer has a resistance of 100 $\Omega$and requires 1 mA for full scale deflection.To make this into a voltmeter reading 1 V full scale, connect a resistance of:
A)1000 $\Omega$in parallel
B)900 $\Omega$ in series
C)1000 $\Omega$in series
D)10 $\Omega$ in parallel
E)0.1 $\Omega$ in series

Question

Quizplus · Accepted Answer

To convert a galvanometer into a voltmeter that reads up to 1 V with a full scale deflection at 1 mA, the total resistance needed is V/I = 1V / 0.001A = 1000 ohms. Since the galvanometer already has a resistance of 100 ohms, an additional 900 ohms must be added in series to achieve the desired total resistance.

A Certain Galvanometer Has a Resistance of 100 Ω\OmegaΩ And Requires 1 MA for Full Scale Deflection

A Certain Galvanometer Has a Resistance of 100 $\Omega$ And Requires 1 MA for Full Scale Deflection