An electric refrigerator rated 400W operates 8 hours/day. What is the cost of the energy to operate it for 30 days at rs.4.00 per KW h?
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It takes 8hr for 400W.
8hr=400W
Now convert 30days into hours.
30 x 24= 720hr
Now we have to see how many times 8hr lies in 720hr.
> 720hr/8hr = 90
= 90 times 8hr is in 720.
= if for 8hr= 400W,then, 90hrs = 90x400 = 36000W.
=we have to convert it into KiloW = 36000/ 1000
= 36KW.
If ₹4 Is for per KW then 36x 4 =₹ 144. ANSWER.
8hr=400W
Now convert 30days into hours.
30 x 24= 720hr
Now we have to see how many times 8hr lies in 720hr.
> 720hr/8hr = 90
= 90 times 8hr is in 720.
= if for 8hr= 400W,then, 90hrs = 90x400 = 36000W.
=we have to convert it into KiloW = 36000/ 1000
= 36KW.
If ₹4 Is for per KW then 36x 4 =₹ 144. ANSWER.
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