Question

Define power. State commercial unit and si unit of electrical energy. An electric heater of 400w works for 2 hours . Find the electrical energy units consumed in a day.

Answer 1

Electric Power is the Rate Of Electrical Energy flowed per Unit Time.

SI Unit Of Electric Energy is Joules and the Commercial Unit is kilowatt-hour.

$power = \frac{energy}{time}$

$400w = \frac{energy}{2}$

$energy = 400 \times 2$
Energy = 800Joules

Answer 2

Electric Power is the Rate Of Electrical Energy flowed per Unit Time.  

SI Unit Of Electric Energy is Joules and the Commercial Unit is kilowatt-hour.  

power =  \frac{energy}{time}  

400w =  \frac{energy}{2}  

energy = 400 \times 2

Energy = 800Joules