Electric Power Energy Cost

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Presentation transcript:

Electric Power Energy Cost October 4, 2017 Electric Power Energy Cost

Drill - Take out Vocabulary Chart An electrical appliance draws 18.0 amperes of current when connected to a 150-volt source of potential difference. What is the total amount of power dissipated by this appliance? How much does your household pay for electricity? What happens to the amount of energy used by electric devices when you switch from one setting to another? Is it practical to use electric devices in the lowest setting?

Electric Power Electric Power = rate of converting electric energy into other forms of energy (i.e. heat, light) P = IV Power is measured in Watts (1 watt = 1 joule/1 second) So… P = E/t “E” is electric energy

Electric Energy Electric Energy = calculated by multiplying power by time. P = E/t So… E = Pt Measured in joules of kWh Convert power in watts  kilowatts Multiply by time in hours

Cost of Electric Energy Total cost = (EkWh)(cost/kWh) Total cost = (Electric energy) x (cost per kWh)

Example #1 A television set draws 2.0 A when operated on 120 V. How much power, in watts, does the set use? If the set is operated for an average of 7.0 h/day, what energy in kWh does it consume per month (30 days)? At 11¢ per kWh, what is the cost of operating the set per month?