SOLUTION: If the basic charge for electricity is $0.0683/kWh, how much will it cost per year to run a 60W porch light, 8 hrs/day, everyday? Please show all work. Thank you. It gets tricky

You can put this solution on YOUR website!
You don't have to get involved with joules or units other than those mentioned in the problem.
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Look at the problem this way. In one hour the bulb consumes 60 watts times 1 hour which
is the same as 60 watt*hours. To convert this to kw*hours, just divide by 1000. When you
do this division you get:
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60 w*hr/1000 w/kw = 0.060 kw*hr
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Units check:
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So for each hour it runs, the bulb uses up 0.060 kw*hr of energy.
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How many hours does the bulb run per year? At 8 hours per day for 365 days in the year, the
bulb runs 8 times 365 hours which is 2920 hours.
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Units check:
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Then in a year the total consumption is 0.060 kw*hr for each hour times the 2920 hours in
a year for an annual amount of:
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kw*hr per year.
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Units check:
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And at a cost of $0.0683 for each kw*hr the annual cost to run the bulb will be:
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$0.0683 * 175.2 = $11.96616 which rounds to $11.97.
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Units check - using D to represent dollars):
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Everything checks. Hope this helps you to see your way through this problem.