Question

An electric refrigerator rated 400w operates 8hr/day what is the cost of the energy to operate it for 30 days at rupees 3.00 per kwh

Answer 1

Watts consumed each Day is
800*8=6400Whr
Energy consumed in 30 days is
6400*30=192000W/hr
192000W=192kWhr
Cost of 1kwh is 3.00
Therefore cost of 192kwh is ₹576