Question

derive the relation between electrical power and joule

Answer 1

The watt is the most commonly used unit of measure for power. It measures the rate of energy transfer. A watt equals a joule per second. If a smart phone uses five joules of energy every second, then the power of the phone is five joules per second, or five watts.....

HOPE it helps!!!!!

Answer 2

Heya !!!!

Here you go ....

We know , electrical energy = electric power × time

So, 1 kWh = 1000 Wh
1 W = 60 ×60 s = 3600 s.
1 kWh = 1000 Js^-1 × 3600 = 3600000 J
= 3.6 × 10^6 J