Write a mathematical expression for Joule’s law of heating effect of current. Name one device which works on this principle.

Question

Philoid · Accepted Answer

We know that H = VIT

And V = IR by Ohm’s law

⇒ H = (IR)IT

⇒ H = I²RT

This is the Mathematical form of the Joule’s law of heating effect.

Iron and heater are the devices that use the Joule’s law of heating effect.