What is the cost of lighting a 0.5-kilowatt outdoor light for 8 hours, if electricity costs 7.5¢ per kilowatt-hour?
Question
What is the cost of lighting a 0.5-kilowatt outdoor light for 8 hours, if electricity costs 7.5¢ per kilowatt-hour?
Solution
To calculate the cost of lighting a 0.5-kilowatt outdoor light for 8 hours, follow these steps:
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Determine the total amount of kilowatt-hours (kWh) used. This is done by multiplying the kilowatts of the light (0.5 kW) by the number of hours it is used (8 hours). So, 0.5 kW * 8 hours = 4 kWh.
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Next, calculate the cost. The cost of electricity is given as 7.5¢ per kilowatt-hour. So, multiply the total kWh used (4 kWh) by the cost per kWh (7.5¢). So, 4 kWh * 7.5¢ = 30¢.
So, the cost of lighting a 0.5-kilowatt outdoor light for 8 hours is 30 cents.
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