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timofeeve [1]
2 years ago
14

In my classroom there are 72 35-watt (W) light bulbs. How much will it cost to light my room for an entire school year if the co

st of electricity is $0.10 per kilowatt-hours (kWh)? My work year is 187 days, beginning at 7:15 am and ending at 2:45 pm.
Advanced Placement (AP)
1 answer:
natita [175]2 years ago
5 0

The direct and easy solution for this problem is through dimensional analysis. This is done by cancelling out the same units of dimensions resulting to the unit of what is asked. In this case, the resulting unit should be in $.

The number of hours in a day from 7:15 am to 2:45 pm is 7.5 h. In 187 days, that would be:

187 days * 7.5 h/day = 1402.5 h

The rest of the solution goes:

1402.5 h * $0.1/kWh * 1 kW/1000 W * 35 W/bulb * 72 bulbs =

$353.43

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