Question

A galvanometer of 50 ohm resistance has 25 divisions. A current of 4 × 10–4 ampere gives a deflection of one division. To convert this galvanometer into a voltmeter having a range of 25 volts, it should be connected with a resistance of

• A. 245 Ω as a shunt
• B. 2550 Ω in series
• C. 2450 Ω in series
• D. 2500 Ω as a shunt

Answer 1

Answer: (C)

2450 Ω in series

Answer 2

To convert the galvanometer into a voltmeter with a 25-volt range, connect it in parallel with a resistance of 6250 ohms (25V / 4 × 10⁻⁴ A).