How much energy, in joules and kW•h, is consumed by a 200 W stereo if it is left on for 4.0 h?
12. A portable hair dryer, plugged into a 220 V outlet, has a current of 10 A flowing through it. What is the power rating of the hair dryer?
13. A meter reader determines that a business has used 4550 kW•h of energy in two months. If electricity costs 5 pesos per kW•h, calculate the bill.
14. An electric heater draws 1300 W of power. Electricity costs 6 pesos per kW•h. How much does it cost to operate the heater 4.0 h a day for 30 days?
15. A toaster is used an average of 240 minutes a month. The toaster draws 9.0 A of current from a 220 V outlet. If electricity costs 8 pesos per kW•h, how much will it cost to operate the toaster for one year?
16. A countertop convection oven is plugged into an outlet that provides a potential difference of 220 V. What is the power rating of the oven if the current is 16 A?
17. A DVD player that is not being used still uses energy at a rate of 25 W. What current is passing through it if the DVD player is plugged into a 220 V electrical outlet?
18. Assume that the electric utility company charges 2 pesos for every kW•h of energy. How much does it cost to:
a) operate a dryer that uses 25 A of current at 240 V for 1.75 hours?
b) operate twelve 100 W light bulbs for an average of 5 hours per day?
c) operate a refrigerator for a week if it draws 2.5 A of current from a 110 V source that turns on for 15 minutes every hour?
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