A 400 W computer is turned on 8 hours per day. If electricity costs 10 cents per kwh then the cost to run the computer annually is 116800 dollars.
Energy is dependent on the power consumed for a given period of time.
Given,
Power = 400W
Time = 8 hours/day
Cost of 1KWh = 10cents
We know that,
Energy consumed = Power × time
So,
Energy consumed in one day = Power × time
Energy consumed in one day = 400 × 8h
Energy consumed in one day = 3200KWh
Now,
Energy consumed in 365 day = Energy consumed in one day × 365
Energy consumed in 365 day = 3200 × 365
Energy consumed in 365 day = 11,68,000 KWh
Also,
Cost of 1 KWh = 10 cents
Cost of 11,68,000 KWh = 11,68,000 ×10
Cost of 11,68,000 KWh = 11680000 cents
Now, 1 Cent = 0.01 dollars
11680000 cents = 116800 dollars
Hence, it will cost 116800 dollars to run the computer 8hours per day anually.
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