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Electrical energy consumption Section 9

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Lighting 40 Watts 100 Watts 60 Watts

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Heating 750 Watts 2 kilowatts

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In the kitchen 3 kilowatts 800 Watts

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Entertainment 500 Watts

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Washing 4 kilowatts 10 kilowatts

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Cleaning 700 Watts

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Paying for electricity We pay for the Energy we consume

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Electrical energy meter 1.This is a domestic energy meter 2.Note the units of energy Not the Joule! The kWh – the kilowatt-hour.

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Units of energy 1.Joules - J – small 2.Kilowatt hours – kWh – large Electricity suppliers use the kWh sometimes called THE UNIT

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Electricity bill

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The cost of electrical energy 1.We pay for the energy we use 2.The meter is read usually every 1 month 3.The meter reads the kiloWatts hours of energy used 4.End reading – start reading = kWh used 5.Each kWh has a cost – about 5-26 halalah 6.The total energy cost is calculated from this 7.Sometimes a fixed standing charge is added on

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The energy used 1.If we leave lights on for a long time we will use up more energy than for a shorter time. 2.A kettle transfers 3 000 J of energy every second – this is its power. 3.A lamp transfers 60 J every second – this is its power. 4.The energy used depends on the Power of the device and the time it is left on.

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Calculating the kWh of energy used The number of kWh of energy use can be calculated. 1.Energy = Powerx time We have used 2.Joules= Wattsxseconds Now we have 3.kWh= kWxhours

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Working out the kWh - 1 How much does it cost to run a 5kW heater for 10 hours? 1.kWh used = 5 x 10 = 50 2.Cost= 50x 5 halalah = 250 halalah =SR2.50

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Working out the kWh - 2 How much does it cost to run a 60W lamp for 20 hours? First you must convert W into kW by dividing by 1000 1.60 W = 60/1000kW = 0.06 2.kWh used = 0.06 x 20 = 1.2 kWh 3.Cost= 1.2 x 5 = 6.0 halalah

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Electrical power DevicePower (W) Power (kW) Time on in a month(h Energy used (kWh)

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