Question

Find the energy in kWh consumed in 10 hrs by four devices of power 500 W each

Answer 1

No. of devices = 4

Time = 10h

Power = 500w each
 

Energy = No. of devices X Time X Power

             =  4 X 10h X 500w

             =  20000wh

             =  20000/1000 = 20 Kwh 

Answer 2

Answer:

Known Terms:-

KWh = kilowatt hour

W =  Watt

Given:-

Power consumed by four device = 500 W = $\frac{500}{1000}$ = 0.5 kW

Time taken to consume the devices = 10 hours

To Find:-

Energy consumed.

Formula to be used:-

Power = Energy/Time

Solution:-

Power = Energy/Time

Energy = Power × Time

Putting all the values, we get

Energy = 0.5 × 10

Energy = 5 kWh

Energy consumed by four devices

= 4 × 5

= 20 KWh or (20 units)

Hence, Energy in kWh consumed in 10 hrs by four devices is 20 KWh