Write joules heating effect rule.

Joule’s Heating effect rule is given by three statements,

I. H is directly proportional to I², H I² .

II. H is directly proportional to R, H R .

III. H is directly proportional to t, H t .

Where H is heat generated by resistance ; R is the resistance ; I is the current through resistance ; t is the time of current passing.

W = QV

W = (It)V [Q = It by the equation of charge and current]

H = (It) × (IR) [V = IR by Ohm’s law]

H = I²Rt