# Energy in the homePage 5

#### WATCH ALL SLIDES

THE THREE PIN PLUG

1.Collect a diagram of the three pin plug which has been

provided.

Information :- the earth is for safety .The fuse is for safety,

and the switch is for safety.The electricity flows FROM the

LIVE wire and BACK via the NEUTRAL

3.You will be shown how to wire the plug by your teacher.

Slide 33

energy

electrical safety in the house

THE THREE PIN PLUG CONT`D

THE FUSE

A fuse is a thin piece of wire which will melt if too much

current flows through it.If more than 3 amperes flows through

a 3 ampere fuse it will melt and will cause all the electricity to

be switched off.This means that the plug wires cannot overheat

and cause a fire.Fuses are of two types in a three pin plug.

If an appliance uses more than 3 amperes(3A) then a 13 ampere

fuse must be used.If it uses less than 3A then a 3A fuse is used.

INFORMATION

Slide 34

ELECTRICAL ENERGY

Fuses.

We generally have two types of fuse , the 3Amp and the 13 Amp.

The fuse is a safety device in the three pin plug.

If the power of an appliance is greater than 700Watts , e.g. a kettle , we use a 13Amp fuse.If it is less than 700 Watts , e.g. a lamp , we fit a 3Amp fuse.

Slide 35

energy

electrical safety in the house

INFORMATION THE EARTH WIRE

Normally the earth does nothing in a circuit, but if the live wire

somehow touches the casing of an appliance such as a toaster,

You would get an electric shock and be badly injured.To stop this

happening,the earth wire causes a large current to flow.This

blows the fuse and the appliance becomes dead.

Slide 36

NON RENEWABLE SOURCES OF ENERGY

The Fossil Fuels.

These are coal , oil and gas.

Oil and Gas are made from dead sea creatures millons of years old.

Once they have been used they can no longer be used and are therefore running out.

Slide 37

CRUDE OIL

Crude oil is a mixture of hundreds of different compounds and is difficult to burn.

It is taken from the worlds oil fields to refineries where it is cleaned.

It is separated into different chemicals we can use.

Each different chemical is separated out at a different temperature.

Slide 38

CRUDE OIL

Crude oil products include the following ,

Bottled gas at 200C.

Petrol at 700C for vehicles.

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