If electric energy costs 15 cents per kilowatt-hour, the cost of a 100-W lightbulb glowing continuously for 30 days is

Name: If electric energy costs 15 cents per kilowatt-hour, the cost of a 100-W lightbulb glowing continuously for 30 days is
Brand: Quizplus
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Question

Quizplus · Accepted Answer

A 100-W lightbulb uses 0.1 kW. Over 30 days, it uses 0.1 kW * 24 hours/day * 30 days = 72 kWh. At 15 cents per kWh, the cost is 72 kWh * $0.15/kWh = $10.80, which rounds to $11.

If Electric Energy Costs 15 Cents Per Kilowatt-Hour, the Cost