The emf of a battery is 10V.A voltmeter connected across its plates reads 9.8V.The battery delivers a current of 0.4A when connected to a resistance of 24 ohm.Find the resistance of voltmeter.
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Explanation:
Given The emf of a battery is 10 V. A voltmeter connected across its plates reads 9.8 V.The battery delivers a current of 0.4 A when connected to a resistance of 24 ohm.Find the resistance of voltmeter.
- We know that
- Total resistance = R + Ri
- 0.4 = 10 / Rt
- Rt = 10 / 0.4
- = 25 ohm
- Ri = Rt – R
- = 25 – 24
- = 1 ohm
- 10 / Ri + Rv = 9.8 / Rv
- 10 Rv = 9.8 Rv + 9.8
- 9.8 = 0.2 Rv
- Rv = 9.8 / 0.2
- Rv = 49 ohm
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