Find the increase in the amount of heat generated in conductor if another conductor of double resistance is connected in the circuit keeping all other factors unchanged.

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TextJoule's Law of HeatingCalculation of Electrical Energy ConsumptionCBSE PYQ

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In the given circuit calculate the power consumed in watts in the resistor of 2 Ω :

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An electric iron of resistance 20 Ω draws a current of 5 A. The heat developed in the iron in 30 seconds is :

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Write Joule's law of heating. How is this effect useful in electric circuits where fuse is used as a safety device ?

TextJoule's Law of HeatingElectric Fuse and Its Function

When electric current flows in a purely resistive circuit electrical energy gets fully converted into heat energy. The amount of heat produced (H) in the circuit is found to be directly proportional to (i) the square of current (I²) (ii) the resistance (R) of the conductor and (iii) the time (t) for which current flows. In other words H = I²Rt. Electrical devices such as an electric fuse, electric heater, electric iron etc. are all based on this effect called heating effect of electric current.

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