Current Electricity

Related Questions

• A galvanometer of resistance $25\,\Omega $ gives full scale deflection for a current of 10 milliampere, is to be changed into a voltmeter of range 100 V by connecting a resistance of ‘R’ in series with galvanometer. The value of resistance R in $\Omega $ is

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• Three resistances of magnitude 2, 3 and 5 ohm are connected in parallel to a battery of 10 volts and of negligible resistance. The potential difference across $3\,\Omega$ resistance will be

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• If each of the resistance of the network shown in the figure is R, the equivalent resistance between A and B is

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• In the given figure, battery E is balanced on 55 cm length of potentiometer wire but when a resistance of 10 $\Omega$ is connected in parallel with the battery then it balances on 50 cm length of the potentiometer wire then internal resistance r of the battery is

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• A heating coil can heat the water of a vessel from $20^\circ C$ to $60^\circ C$ in 30 minutes. Two such heating coils are put in series and then used to heat the same amount of water through the same temperature range. The time taken now will be (neglecting thermal capacity of the coils)

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