Question

heating effect of electric current

Answer 1

When current flows through a conductor, heat energy is generated in the conductor. The heating effect of an electric current depends on three factors:

* The resistance, R of the conductor. A higher resistance produces more heat.
* The time, t for which current flows. The longer the time the larger the amount of heat produced
* The amount of current, I. the higher the current the larger the amount of heat generated.

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 called the Joule’s equation of electrical heating.

Electrical energy and power

The work done in pushing a charge round an electrical circuit is given by w.d = VIt

So that power, P = w.d /t = VI

The electrical power consumed by an electrical appliance is given by P = VI = I2R = V2/R


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Answer 2

when an electric current is passed through a high resistance wire the wire becomes hot and produce heat is this is called heating effect of electric current.

The amount of heat produced in a wire due to heating effect depends on material of wire length of wire thickness of wire.

magnitude of current pass through the wire.

Greater resistance of wire greater will be heat produce

greater the magnitude de of current pass later will be heat produce.