Question

State Joules law of heating.................​

Answer 1

Answer:

Joule's law of heating states that when a current 'i ' passes through a conductor of resistance 'r' for time 't' then the heat developed in the conductor is equal to the product of the square of the current, the resistance and time.

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Answer 2

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Joules law of heating :

When an electric current passes through a conductor for some time, the conductor gets heated up. Thus heating of a conductor due to the flow of electric current through it is known as Joule's law of heating.

Heat produced = I²RT

the heat produced in a wire is directly proportional to ;

1. square of the current
2. resistance of wire
3. time ( t) for which current is passed.

Proof of joules law of heating;

The amount of work done when an electric charges, move against a potential difference which is denoted by V is given by;

W = Q× V ....(1)

from the defination of current we know that

I = Q/t

↪ Q = I× t ....(2)

from ohms law

V = IR ......(3)

Putting Q = I× t and V = IR

in equation (1)

then we get

W = I × t × I×R

= I²RT

Assuming that all the electrical work done or the electrical energy consumed is converted into heat energy;

↪Heat produced = work done

Heat produced = I²RT

this is known as joules law of heating