if it costs 8.9 cents/kW.h, how much would it cost to leave a 60 W bulb for one hour?
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Not much. Not if that is the only consideration.
60 watts * [ 1 kw / 1000 watts] = 0.060 kw
1 kw hour costs 8.9 cents
0.060 kw hour costs x
x = 0.060 * 8.9 = 0.534 cents which means for two hours it will cost about 1 cent. I guess during the course of a month, it could add up.
60 watts * [ 1 kw / 1000 watts] = 0.060 kw
1 kw hour costs 8.9 cents
0.060 kw hour costs x
x = 0.060 * 8.9 = 0.534 cents which means for two hours it will cost about 1 cent. I guess during the course of a month, it could add up.
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Factor label it
1h x 60kW x 1kW 8.9c
1 x 1000 x kWh
kWh will cancel out, leaving you with
60 x 8.9
1000 =.534cents
It looks smaller, but a 60W bulb is .06kW, so it's really .06x8.9.
1h x 60kW x 1kW 8.9c
1 x 1000 x kWh
kWh will cancel out, leaving you with
60 x 8.9
1000 =.534cents
It looks smaller, but a 60W bulb is .06kW, so it's really .06x8.9.
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8.9 cents per kWh = .0089 cents per Wh.
To consume 60W for an hour = .0089 X 60, or 0.534 cents.
To consume 60W for an hour = .0089 X 60, or 0.534 cents.