Physics P1 1.4 Conduction.

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What are the best conductors?
Metals.
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What are good insulators?
Materials such as wool and fibreglass.
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What is conduction in a metal due to?
Conduction in a metal is mainly due to free electrons transferring energy inside the metal.
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Why are non-metals poor conductors?
Non-metals are poor conductors because they do not contain free electrons.
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Where does conduction mainly occur?
In solids because most liquids and gasses are poor conductors.
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What happens when one end of a solid is heated?
The particles at that end gain kinetic energy and vibrate more. This energy is passed to neighbouring particles and in this way the energy is transferred through the solid. This process occurs in metals.
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What happens when metals are heated?
Their free electrons gain kinetic energy and move through the metal, transferring energy by colliding with other particles, hence all metals are good conductors.
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What are poor conductors called?
Insulators.
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Why are materials such as wool and fibreglass good insulators?
The contain trapped air.
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Why are saucepans often made of metal with wooden handles?
The metal base of a saucepan is a good condo tor so heat is conducted quickly to the food in the pan, but the wooden handle is a poor conductor so it prevents someone picking up the saucepan getting burnt.
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Why are materials that trap air good insulators?
Air is a poor condo tor so materials that trap air are good insulators.
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***FIND AND LEARN SOME EXAMPLES OF INSULATORS AND HOW THEY ARE USED!***
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Card 2

Front

What are good insulators?

Back

Materials such as wool and fibreglass.

Card 3

Front

What is conduction in a metal due to?

Back

Preview of the front of card 3

Card 4

Front

Why are non-metals poor conductors?

Back

Preview of the front of card 4

Card 5

Front

Where does conduction mainly occur?

Back

Preview of the front of card 5
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