Current Electricity

Related Questions

• A cell of constant e.m.f. first connected to a resistance ${R_1}$ and then connected to a resistance ${R_2}$. If power delivered in both cases is then the internal resistance of the cell is

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• A voltmeter has a range 0-V with a series resistance R. With a series resistance 2R, the range is 0-V'. The correct relation between V and V' is

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• A galvanometer of 50 ohm resistance has 25 divisions. A current of $4 \times 10^{–4}$ 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

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• The internal resistance of a cell of e.m.f. 12V is $5 \times {10^{ - 2}}\,\Omega $. It is connected across an unknown resistance. Voltage across the cell, when a current of 60 A is drawn from it, is

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• A piece of wire of resistance 4 ohms is bent through $180^\circ$ at its mid point and the two halves are twisted together, then the resistance is

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