7. An electric motor with an efficiency of 80% has a power output of 4.00 horsepower. The power company charges $0.15 per kWh. If the motor runs continuously for 3.00 hours, how much does it cost to run the motor? (Hint: kWh = kW*h and 1 horsepower = 0.746 kW)

Cost of Electricity A refrigerator is an appliance that is left running all the time. In New Orleans, Louisiana, the average residential electricity rate charged by Entergy is 9.82¢/kWh. Using this rate, how much will it cost to operate a refrigerator that requires 220 Watts in one month. You can use the following steps: 1. Convert power to kW = 2. Time (in hours) in one month (30 days) = %3D 3. Energy consumption (Power x Time) = 4. Cost (Rate x Energy) in dollars =

Problem 2: A large household air conditioner may consume 15.5 kW of power during normal operation. What is the cost of operating this air conditioner, in dollars, 3.5 h per day for 27 d if the cost of electricity is $0.105 per kW h ? cost =

The cost of electricity in Los Angeles is 5 cents per 1,000,000 joules. Suppose a small 2000-watt air conditioning unit is operated continuously for 3 hours. What is the cost (in dollars) of the total energy consumed?