Energy in the home

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Slide 25

energy

energy losses

CAVITY WALL INSULATION

The cavity or space between outer walls can be filled with material

such as polystyrene foam to stop heat loss.

Reducing energy waste.

Have showers instead of baths.

Close doors when you leave a room.

Switch off heaters in rooms you are not using.

Don`t boil a full kettle if you are only making one cup of tea.

Slide 26

Simple energy savers

energy

Thermostats -: used in most homes in several situations.

They turn the heating on or off in a room automatically.

They can be placed on the walls in a room or on individual

radiators.

An oven thermostat allows you to set the oven at a certain

temperature.

An iron thermostat allows the iron to be set at a temperature

which will not burn your clothes.

Slide 27

energy

simple energy savers

Your immersion heater has a thermostat to control the temperature

of the water.

Your kettle has a thermostat which does the same job.

Slide 28

energy

simple energy savers

THE THERMOSTAT HOW IT WORKS

The thermostat consists of two metals stuck together back to back.

brass

iron

Room temperature

When it gets cold or hot ,one metal expands more than the other

and the metal bar bends up or down.This arrangement is called a

Bimetallic strip.

Experiment -: place the bimetallic strip in a bunsen flame and see

what happens.

Slide 29

energy

simple energy savers

brass

iron

brass

iron

cold

hot

The bimetallic strip should look as shown above.

Slide 30

Electrical safety in the home

energy

Electricity can be sent over large distances.

Electrical cables allow you to send electricity to different

parts of a room.

Electricity can also be very dangerous if not treated properly.

An electric shock can paralyse us and cause our heart to stop

beating.

Deaths from electric shocks is more common in young people

and the elderly.

Slide 31

energy

electrical safety in the home

The wires in a three pin plug are coloured as follows :-

1 LIVE BROWN

NEUTRAL BLUE

3. EARTH GREEN/YELLOW

Slide 32

energy

electrical safety in the house