Current Electricity

Related Questions

• 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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• A constant voltage is applied between the two ends of a metallic wire. If both the length and the radius of the wire are doubled, the rate of heat developed in the wire

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• For what value of R the net resistance of the circuit will be 18 ohms

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• Two resistors of $6\,\Omega $ and $9\Omega $ are connected in series to a 120 volt source. The power consumed by the $6\,\Omega $ resistor is

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• In the circuit shown below, the power developed in the $6\Omega$ resistor is 6 watt. The power in watts developed in the $4\Omega$ resistor is

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