Question

What is meant by heating effect of current ?Derive an expression for it

Answer 1

Answer:

Heating effect of electric current: It states that Heat is directly proportional to square of current flowing through the conductor , resistance of the conductor and time till which current flows through it. EXPRESSION FOR JOULE'S LAW OF HEATING. H = I^2 R t.

When an electric current is passed through a conductor, the conductor becomes hot after some time and produce heat. This happens due to the conversion of some electric energy passing through the conductor into heat energy. This effect of electric current is called heating effect of current.

Heat is the transfer of kinetic energy from one medium or object to another, or from an energy source to a medium or object. ... This is the amount of heat required to raise the temperature of one pound of pure liquid water by one degree Fahrenheit.

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. ... Joule's law states the amount of heat production in a conductor is : Directly proportional to the square of electric current flowing through it

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