Power: If electricity costs 6.00¢/kWh (kilowatt-hour), how much would it cost you to run a 120 W stereo system 4.0 hours per day for 4.0 weeks?

Question

Quizplus · Accepted Answer

First, convert the power of the stereo system to kilowatts: 120 W = 0.12 kW. Then, calculate the total energy used over 4 weeks (28 days): 0.12 kW * 4 hours/day * 28 days = 13.44 kWh. Finally, multiply the total energy by the cost per kWh: 13.44 kWh * 6.00¢/kWh = 80.64¢, which rounds to $0.81.

Power: If Electricity Costs 6