What is the cost of electrical heating 50 liters of water from 40degree celsius to 100degree celsius at USD 8.0 /kwh?

Answer 1

Cost = (energy added in kw-hours)/(cost per kwatt-hour)

The number of kwatt-hours is
Q = 50,000 g * 60 C * 4.184 J/cal * 1.00 cal/g*C *10^-3 kj/j*1/3600 h/s)
= 3.49 kw-h

You might not have copied the cost per kw-h correctly. It is more likely to be 8 cents than 8 dollars.

This looks like roughly the cost of filling a bath tub with hot water.

Answer 2

thank you very much my friend.