Joule’s Second Law of heating

Heating Effect of Electric Current and Its Applications

When a current flows through a conductor, heat energy generates in the conductor. The heating effects of electric current depend on three factors:

The resistance of the conductor. A higher resistance produces more heat.
The time for which the current flows. The longer the time the amount of heat production is high.
Higher the current the amount of heat generation is also large.
Hence the heating effect produced by an electric current, I through a conductor of resistance, R for a time, t is given by H = I2Rt. This equation is the Joule’s equation of electrical heating.

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Electric currents generate heat as they pass through resistive elements of a circuit. The higher the resistance of a conductor, the more heat will be generated as current passes through it. Thus, generation of heat by electric current as it passes through a conductor is an inevitable consequence. This heating effect is used in many appliances, such as electric kettles, electric irons, heaters and electric bulbs.