You turned on your laptop at 3:00 PM, and finished your
homework at 9:00 PM, but you forgot to turn it off before
going to bed. At 7:00 AM next morning, the laptop finally
ran out of battery. If the computer runs at 150 watts, and
the electricity costs Rs 10 Rs per kilowatt hour. Given that
this happened each school day in the month i.e. for 25
days how much did this careless wastage of electricity cost
you each month? / आपने अपने लैपटॉप को 3:00pm पर खोला और
अपना गृहकार्य 9:00 pm पर समाप्त किया, परंतु आप सोने से पहले लैपटॉप
Answers
Given : You turned on your laptop at 3:00 PM, and finished your homework at 9:00 PM,
you forgot to turn it off before going to bed.
At 7:00 AM next morning, the laptop finally ran out of battery
the computer runs at 150 watts, and the electricity costs Rs 10 Rs per kilowatt hour
this happened each school day in the month i.e. for 25 days
To Find : how much did this careless wastage of electricity cost
you each month
Solution:
You turned on your laptop at 3:00 PM, and finished your homework at 9:00 PM,
So for that time there is no wastage as its being used
Wastage hours are from 9:00 PM to 7:00 AM
= 10 hours
Electricity wasted = 150 * 10 = 1500 Wh
= 1.5 kWh
Cost per day of wastage = 1.5 * 10 = Rs 15
Wastage cost for 25 days = 25 * 15 = 375 Rs
this careless wastage of electricity cost you each month = Rs 375
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