, the conductor heats up Thus,
in an actual conductor, an amount of energy dissipated as heat in the
conductor during the time interval Dt is,
DW = I VDt
(3 31)
The energy dissipated per unit time is the power dissipated
P = DW/Dt  and we have,
P = I V
(3 32)
Rationalised 2023-24
Current
Electricity
93
Using Ohm’s law V = IR, we get
P = I 2 R = V 2/R
(3