What is the cost of lighting a 500 watt outdoor light for 8 hours, if electricity cost 7.5 cents per kilowatt-hour

Answer 1

To calculate the cost of lighting a 500 watt outdoor light for 8 hours, we need to determine the total energy consumption in kilowatt-hours (kWh) and then multiply it by the cost of electricity.

First, convert the power consumption from watts to kilowatts:
500 watts = 500/1000 = 0.5 kilowatts

Next, calculate the total energy consumption:
Energy consumption = Power (kW) x Time (hours)
Energy consumption = 0.5 kW x 8 hours = 4 kWh

Finally, calculate the cost:
Cost = Energy consumption (kWh) x Cost per kWh
Cost = 4 kWh x $0.075/kWh = $0.30

Therefore, it would cost $0.30 to light a 500 watt outdoor light for 8 hours at a rate of 7.5 cents per kilowatt-hour.