Question

State and derive joule's law

Answer 1

Hola Friend

Here is your answer..............

Joules Law states that the heat produced in the conductor is always directly proportional to:

1) the square of the current flowing through the conductor.

2) resistance of the conductor.

3) time for which the current flows through the conductor.

Deriving Joules Law:

Potential difference V = Work done W / Charge moved Q

V = W / Q

W = V * Q.......1

Now

P = W / t.

P = V * Q / t ..... from 1

P = V * I ......since Current I = Q / t

.........2

Now,

P = W * t

W = P * t

W = VI * t

By ohm's law

V = I * R

therefore

W = I*R*I * t

W = I^2 *R *t

Thank u