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KS4 Electricity

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Buying electricity question 1: Buying electricity - question 2: 06895674 In your home will be an electricity meter. It records how much electricity you use in units. – PowerPoint PPT presentation

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Title: KS4 Electricity


1
KS4 Electricity Buying Electricity
2
Buying electricity
In your home will be an electricity meter.
It records how much electricity you use in units.
From the number of units you use your electricity
bill is calculated.
26
How many units have been used here? ______
06895674
06895702
3
Cost of electricity
The cost of electricity is the number of units
multiplied by the cost per unit
Cost Number of units x cost per unit
Example How much would 10 units of electricity
cost at a price of 9p per unit?
Cost 10 x 9p 90 p
4
What is one unit of electricity?
Energy Power x time Units kWh
1 unit of electricity 1 kWh
Example How many units of electricity is 17.6
kWh?
17.6 units
5
Buying electricity question 1
A kettle uses 45.2 kWhr of energy. If
electricity costs 10p per unit, how much does it
cost to use the kettle?
Number of units Number of units of electricity
is 45.2 units
Cost of electricity Cost 45.2 x 10 p 452p
or 4.52
6
Buying electricity - question 2
An iron that operates at a power of 3 KW for 4
hours uses electricity that costs 8p per unit.
How much does it cost for the electricity that
it uses?
Number of units kWhr 3kW x 4hr 12
kWhr Number of units of electricity is 12 units
Cost of electricity Cost 12 x 8 p 96p
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