The Cost of Electricity

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Presentation transcript:

The Cost of Electricity

Power We compare electrical devices by looking at how much power they use. The symbol for Power is P The unit for power is Watt (W)

a light bulb is 60 W a microwave is 1500 W a clothes dryer is 5000 W For Example: a light bulb is 60 W a microwave is 1500 W a clothes dryer is 5000 W

A larger unit for power is the kilowatt (kW) 1 kW = 1000 W To convert Watts to Kilowatts divide by 1000.

Turn to the Science 9 Electricity – Study Questions Sheet Complete question 1

Question 1 2000 W

b. 5000 W

c. 1200 W

d.1650 W

e. 500 W

f. 8 W

Turn to Science 9 Electricity – Study Questions Sheet Cost To find the cost of electricity, multiply the price by the power (in kW) by the time (in h). Cost = Price x Power x Time Turn to Science 9 Electricity – Study Questions Sheet

Question 2 A 6 kW heater runs for 3 hours. If electricity is sold at a rate of 5 cents/kWh, what is the cost of the electricity used?

Question 2 P = 6 kW t = 3 hours Price = 5 ¢/kW∙h Cost = Price x Power x Time = 5 ¢/kW∙h x 6 kW x 3h = 90 ¢

Question 3 Calculate the cost of operating a 400 W spotlight for 2.0 h at a rate of 6.0 cents/kWh.

Question 3 P = 400 W t = 2 hours Price = 6 ¢/kW∙h Cost = Price x Power x Time = 6 ¢/kW∙h x 0.4 kW x 2h = 4.8 ¢

Question 4 Find the cost of operating a 3600 W oven for 3.0 h, at a rate of 5.0 cents/kWh.

Question 4 P = 3600 W t = 3 hours Price = 5 ¢/kW∙h Cost = Price x Power x Time = 5 ¢/kW∙h x 3.6 kW x 3h = 54 ¢

Complete Practice Questions on sheet provided Classwork/Homework Complete Practice Questions on sheet provided