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13.3 ­ Why are electrical Devices so useful?
Why is electricity so useful?


We take electricity for granted in our homes and schools. It is very easy to plug in an appliance or
switch on a light. Electricity is clean, and, if used properly, very safe. It can do all…

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13.3 ­ Why are electrical Devices so useful?
The power of an appliance

How much does it cost to use an appliance?
When we work out the cost of using an appliance, we pay for the energy that has been used. We
could pay for the number of joules used,…

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Question: How much does it cost to watch 4.5 hours of TV which has a power of 300 watts?
Electricity costs 12 p per unit.

13.3 ­ Why are electrical Devices so useful?
How do we get electricity to our homes?

Electrical energy cannot be stored as electricity itself. For…

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Heavy industry 11 000 V
Light Industry 415 V
Homes 230 V

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