Question

derive an expression for value in law of heating​

Answer 1

Answer:

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.

Explanation:

Just see if you understand

Answer 2

H = I2Rt.

(b) (a) Electric fuse.

(b) Electric water heater.

(c) H = 100J , R = 4 Ω , t = 1 sec .

I2 = H / R.