Question

An electric refrigerator rated 400 W is used for 8 hours a day. An electric iron
box rated 750 W is used for 2 hours a day. Calculate the cost of using these
appliances for 30 days, if the cost of 1 kWh is Rs. 3/-.​

Answer 1

Answer:

energy for one day

=(400×8)/1000+(750×2)/1000

=(3200+1500)/1000

=47 KWH

energy for 30 days

=30×47

=1410 KWH

cost=1410×3=₹4230