Question

A 40 W appliance is left on for 2 hours.

(a) Calculate the energy, in, that the appliance transfers during this time.

Answer 1

288000 joule

Answer:

Solution given:

Power =40W

Time =2 hours= 2*60*60=7200 seconds

Now

Energy transfer = Power* Time

=40*7200

=288000 joule

or 288 kilo joule