How much money does it cost to leave on 10 60 watt lights for 15 hours, if the cost of electricity is 8 cents per kWh?

Question

Quizplus · Accepted Answer

First, we need to calculate the total energy consumed by the lights in kWh.

10 lights * 60 watts = 600 watts total 
600 watts * 15 hours = 9,000 watt-hours (Wh)

To convert Wh to kWh, we divide by 1,000: 
9,000 Wh ÷ 1,000 = 9 kWh

Now we can calculate the cost:

9 kWh * $0.08/kWh = $0.72

Therefore, the cost to leave on 10 60 watt lights for 15 hours is 72¢.

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