Question

Describe joules law of heating effect.



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Answer 1

Joule's law states the amount of heat production in a conductor is : Directly proportional to the square of electric current flowing through it. Is directly proportional to the resistance of the conductor. Directly proportional to the time for which electric current flows through the conductor.

A quantitative form of Joule's law is that the heat evolved per second, or the electric power loss, P, equals the current I squared times the resistance R, or P = I2R. The power P has units of watts, or joules per second, when the current is expressed in amperes and the resistance in ohms.

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.

Joule’s law states the amount of heat production in a conductor is :

Directly proportional to the square of electric current flowing through it.

Is directly proportional to the resistance of the conductor.

Directly proportional to the time for which electric current flows through the conductor.

Symbols of component..

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Answer 2

Explanation:-

Joules Law of heating effect:-

Heating effect :- when an electric current is passed through a conductor heat is produced due to collision of electrons with the atoms of conductor ,known as heating effect of electric current.

According to joules Law of heating:-

The heat energy produced in a conductor is directly proportional to the :-

• Square of the current flowing through the conductor.

• Resistance of the conductor.

• Time for which the current flow in the conductor.

When we combine this all , We get

$\huge \boxed{ H \propto I^2 RT}$

$\huge \boxed{H = K I^2RT}$

Where k is the constant of proportionality.

Hence, The heat produced in conductor depends upon the current flows through the conductor, resistance of the conductor and time t for which the current flow.