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**Electrical Energy Use in the Home**

In an electric meter in your home, the electrical energy is measured in kilowatt hours (kW x h).

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**There are 3 600 000J in one kW x h, therefore it is much more practical to use kilowatt hours.**

1 kW x h = 1000W x 3600s = W x S = J

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A kilowatt hour refers to 1000 watts being used over an hour, therefore a 100W bulb would have to be on for 10 hours to equal 1 kilowatt hour.

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**The electrical meter in your home records the total amount of electricity used in your home.**

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In order to calculate the cost of electrical energy used in your home you can use the following formula: Cost = Power (kW) x time (h) x rate ($)

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Appliances Average power W Monthly Energy Use kW x h Approximate Costs $ Air conditioner 750 7.20 – 43.30 Clothes Dryer 5000 4.01 – 12.03 Television 80 5 - 15 0.41 – 1.20 Lighting – 60W bulb 60 5 - 30 0.40 – 2.41 Microwave Oven 1000 5 - 20 1.40 – 1.60

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Example A Calculate the cost of the electricity needed to operate a refrigerator/freezer (500W) for a day if the rate charged for electricity is $0.08/ kW x h First convert watts to kW W x 1kW/1000w = 0.500kW Cost = p x t x rate Cost = 0.500kW x 24hrs x $0.08/ kW x $0.96

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Calculate the cost of running a coffee maker that has a power rating of 0.900kW and operates for 17 hours. (rate is $0.08/ kW x h) Cost = 0.900kw x 17h x $0.08/ kW x h = $1.22

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**2. Calculate the cost of a 1. 5kW electric kettle that operates for 0**

2. Calculate the cost of a 1.5kW electric kettle that operates for 0.80h per day for two weeks. Cost = 1.5kw x (0.8h x 14) x $0.08/ kW x = $1.34

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**3. Calculate the cost of a television that has a power rating of 0**

3. Calculate the cost of a television that has a power rating of 0.120kW uses in one week if it operates for 9 hours every day. Cost = x (9h x 7) x $0.08/ kW x h = $7.64

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4. Calculate the cost of a computer monitor and printer if the monthly energy use is 25 kW x h at a rate of $0.08/ kW x h. Cost = 25 kW x h x $0.08/ kW x h = $2.00

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