What is the cost of lighting a 500-watt outdoor light for 8 hours, if electricity costs 7.5¢ per kilowatt-hour?
To calculate the cost of lighting the 500-watt outdoor light for 8 hours, we need to convert the watts to kilowatts and then multiply it by the electricity cost per kilowatt-hour.
Step 1: Convert watts to kilowatts
500 watts = 500/1000 = 0.5 kilowatts
Step 2: Calculate the total energy consumption
Energy consumption = power x time
Energy consumption = 0.5 kW x 8 hours = 4 kilowatt-hours
Step 3: Calculate the cost of lighting
Cost of lighting = energy consumption x electricity cost
Cost of lighting = 4 kWh x $0.075/kWh = $0.30
Therefore, the cost of lighting the 500-watt outdoor light for 8 hours is $0.30.
State how much larger or smaller the first unit is than the second.
centiliter, microliter
The first unit, centiliter, is larger than the second unit, microliter.
1 centiliter is equal to 10 microliters.
To calculate the cost of lighting a 500-watt outdoor light for 8 hours, we need to follow these steps:
Step 1: Convert the wattage to kilowatts.
Divide the wattage by 1000.
500 watts ÷ 1000 = 0.5 kilowatts
Step 2: Calculate the energy consumption.
Multiply the power in kilowatts by the number of hours.
0.5 kilowatts × 8 hours = 4 kilowatt-hours
Step 3: Calculate the cost.
Multiply the energy consumption by the cost per kilowatt-hour.
4 kilowatt-hours × 7.5¢/kilowatt-hour = 30¢
Therefore, the cost of lighting a 500-watt outdoor light for 8 hours, with electricity costing 7.5¢ per kilowatt-hour, would be 30¢.