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What size is your carbon footprint?
Thermal Insulators and Conductors
In this lesson you are going to learn about
conductors and insulators.Can you remember what
these words mean?
Hmmm and insulators
are like the cotton woolin your head!
Conductors?Don’t they collect tickets
on the bus?
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What size is your carbon footprint?
Thermal Insulators and Conductors
We are going to make acontainer that heats water using the Sun.
Energy from the Sun will need to betransferred to the water. Then you can
use the warm water to wash your hands.
That soundslike fun but what does
TRANSFER mean?
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Thermal Insulators and Conductors
At home energy is TRANSFERRED in lots of ways. Look at thissaucepan where potatoes are beingboiled.
Heat energy is being transferred from the electric ring to the glasshob.
Heat energy is being transferred
from the glass hob to the metalsaucepan.
Heat energy is being transferred from the metal saucepan to the
water and potatoes.
Then can I transfer thepotatoes from the pan to
my stomach?
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Thermal Insulators and Conductors
Radiator
gas waterheater
Here is another example. What do you think is going on?
1. Heat energy from burning gas in the heater is transferred
to w _ _ _ _.2. Heat energy from the hot w _ _ _ _ is transferred to themetal r _ _ _ _ _ _ _ .
3. Heat energy from the metal r _ _ _ _ _ _ _ is
transferred to the r _ _ _ .
radiator room
a t e ra t e r
a d i a t o r
a d i a t o r
o o m
12
3
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Thermal Insulators and Conductors
Hats, coats, gloves and scarves are all insulators. They make itdifficult for heat energy to be transferred from your body tothe cold air, so they keep you warm.
Sometimes we don’t wantheat to be transferred, wewant to keep the heat in.
What do you know aboutall these things?
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Thermal Insulators and Conductors
Tea cosy, burger box and thermos flask all prevent the transfer of heat.
Look at these things.These are insulators too.
What do they do?
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Thermal Insulators and Conductors
glass
Polystyrenecup
Metalmug
Potterymug
Plasticmug
Papercup
Clue
Look at these containers. They will be filled with hot water.Which ones do you think are conductors that will allow thetransfer of heat energy most easily?
How will I knowwhich containers conductheat energy most easily?
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Thermal Insulators and Conductors
A. clear sheet ofglass
B. dark colouredmetal
C. metal
waterpipes
D. thick board,such as
polystyrene
Materials that conduct or insulate are important parts of solarthermal collectors that heat water using the Sun’s energy.
Look at this diagram of a solar thermal collector.
Which parts are conductors and which are insulators?