Question

Calculate the electrical energy consumed in joules if toaster of 60 w is used for 30 min.

Answer 1

P(power)=H/t
t=30*60=1800
60=H/1800
H=1800*60=108000 J

Answer 2

Given:

Power = 60w

time = 30 min

To Find:

the electrical energy consumed in joules.

Solution:

Firstly, converting 30 minutes into seconds.

           Time = 30 min

                    = 30× 60

                    = 1800 sec

Power = E/T

         E = P × T

            = 60 × 1800

            = 108000J

  Converting into KJ

 108000J = 108KJ

Therefore, the electrical energy consumed in joules is 108000J.