Question

Suppose your utility company charges 13 cents per kilowatt-hour of electricity. How much does it cost to operate a chandelier with five 100-watt bulbs for a week? Assume that the light is left on for 24 hours each day.

a) $15.60
b) $10.40
c) $7.80
d) $3.90

Answer 1

The cost to operate a chandelier with five 100-watt bulbs for a week is $1.56.

Step-by-step explanation:

To calculate the cost of operating a chandelier with five 100-watt bulbs for a week, we need to determine the total kilowatt-hours (kWh) of electricity consumed. Each bulb consumes 100 watts, so the total power consumption is 500 watts (5 bulbs x 100 watts).

Since the light is left on for 24 hours each day, the total energy consumed in kilowatt-hours is calculated as follows:

Total energy (kWh) = (total power (watts) x time (hours)) / 1000

Total energy (kWh) = (500 watts x 24 hours) / 1000 = 12 kWh

The utility company charges 13 cents per kilowatt-hour, so the total cost of operating the chandelier for a week is 12 kWh x $0.13/kWh = $1.56.

Therefore, the correct answer is a) $1.56.