Current Electricity

Related Questions

• Resistance of 100 cm long potentiometer wire is 10$\Omega$, it is connected to a battery (2 volt) and a resistance R in series. A source of 10 mV gives null point at 40 cm length, then external resistance R is

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• A galvanometer has resistance of $7\,\Omega $ and gives a full scale deflection for a current of 1.0 A. How will you convert it into a voltmeter of range 10 V

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• If potential $V=100\pm 0.5$ Volt and current $I=10\pm 0.2$ ampere given to us. Then what will be the value of resistance

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• Two identical batteries, each of e.m.f. 2 volt and internal resistance 1.0 ohm are available to produce heat in an external resistance $R = 0.5$ohm by passing a current through it. The maximum Joulean power that can be developed across R using these batteries is

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• The e.m.f. of a cell is E volts and internal resistance is $r$ohm. The resistance in external circuit is also$r$ohm. The p.d. across the cell will be

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