Question

If an electric appliance is rated 1000 W and is used for 2 hours. Calculate the work done in 2 hours.​

Answer 1

Answer:

432 kwh

Explanation:

Answer 2

Answer:

The work done in 2 hours is,  $W=720kJ$

Explanation:

As we all know, power is defined as the rate at which work is completed. It is the amount of work completed in a given amount of time. Watt(W), or joules per second(J/s), is the SI unit of power.

Therefore,$Power = \frac{work done}{time}$

In this question the given information follows:

The Power of an electric appliance is, $P =1000W =1000 J/s$

The time used by the appliance is, t = 2hours

Convert hours into seconds, ie 1hours =3600 seconds

                                   So, 2 hours =2 × 3600=7200s

Hence the work done, W =Power × time =1000×7200 =72,0000J

                 $(1 joule =10^{-3}Kilojoule )$

Therefore the work done in 2 hours is, $W=\frac{720000}{1000} =720kJ$