## Energy Consumption Formula :

Energy consumption formula E_{(kwh)} in kilowatt –hours is equal to the power P_{(w)} in watts and multiply the t_{(h)} in hours and divided by the 1000.Hence the Energy Consumption formula can be written as,

**E _{(kwh)}=P_{(w)}*t_{(h)}/1000**

Where,

E→ energy in kilowatt-hours (kwh)

P→ power in watts

t → hours

## Sample Problems :

## Problem1 :

Calculate the energy consumption in a system that consumes 200watts of power and works for 2hrs a day?

### Solution :

Given,

Power p=200w,

Total number of hours =2hrs

E=P*t/1000

E=200*2*60*60/1000

E=1440Kwh

Therefore the energy consumption is 1440Kwh

## Problem2 :

Calculate the energy consumption a day? In a toy car consumes energy of 600 watts of power if it works for 4 hrs a day using it.

### Solution :

Given,

Power p=600w

Total number o f hours=4hrs

E=P*t/1000

E=(600*4*60*60)/1000

E=8640Kwh