Question

A 100 watt electric bulb is used for five hours.how much energy is consumed by the bulb​

Answer 1

0.5kWh

Step-by-step explanation:

Given, power of the electric bulb,

P=100W=(100/1000)kW=0.1kW ;

time for which bulb is used, t=5h

As P=

`(w)/(t)`

or W=Pt

or W=0.1kW×5h= 0.5kWh

Answer 2

500Whr=0.5kWhr

1Joule=1 Watt×1Sec

100×5×60×60=1.8M joules