Joule’s law

- Joule’s law can be stated as the quantity of heat generated (H) in a conductor of Resistance (R), when a current (I) flows through it for a time (t) is directly proportional to:

i.                     The square of the current.

ii.                    The resistance of the conductor, and

iii.                  The time for which the current flows.

Using Ohm’s Law we can write

H	=	(I2 Rt) cal	=	(V2 t) cal	=	VIt cal
		4.18		4.18R		4.18