Energy - Conduction

8/3/2019 Energy - Conduction

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Starter: Types of Energy 2

This is the energy possessed by

ELECTRICAL CURRENT.

The is the energy an object has if it is high up.

This is the energy stored in

FUELS, FOOD and BATTERIES.

It is released through CHEMICAL

REACTIONS.

Electrical Energy

Chemical Energy

Gravitational Energy



Lesson 3 Objectives

To learn about conduction



Lesson 3 Outcomes

To know when conduction

occurs

To know what a conductor is To know what an insulator is



Why «

Do we cook with wooden spoons?

Why don¶t we use metal spoons?



Thermal Insulators

INSULATORS are MATERIALS that will NOT LET HEATPASS THROUGH THEM EASILY. Which materials below do

you think are good insulators of heat?

Glass

Paper

Air

Rubber

Wool

Steel

Brass

Tin

What do you notice about all the insulators?

They are all NON-METALS.

Non-metals are

good insulators



Thermal Conductors

CONDUCTORS are MATERIALS that will LET HEAT PASSTHROUGH THEM EASILY. Which materials below do you

think are good conductors of heat?

Plastic

Copper

Rubber

Glass

Aluminium

Wood

Iron

Gold

What do you notice about all the conductors?

They are all METALS.

M etals are good

conductors



Heat Transfer

Heat needs to travel through different

substance. To do this, it needs to travel

in different ways:1. Conduction

2. Convection

3. Radiation



ConductionCONDUCTION is when heat moves through a solid. Metals arebetter conductors of heat than plastic or wood. This is why«

These parts aremade of plastic

or wood:

These parts aremade of metal:

Heat energy is passed on to neighbouring particles by

VIBRATIONS, best in SOLIDS



Investigating Conduction

1. Hold a WOODEN ROD and a

COPPER ROD in your hands. Place

the ends of the rods in the YELLOW

SAFETY FLAME of a Bunsen. What

happens? Why?

2. Hold an IRON ROD and a COPPER

ROD in your hands. Place the ends

of the rods in the YELLOW SAFETY

FLAME of a Bunsen. What happens?

Why?3. Look at the rods ± steel, copper,

glass and wood with drawing pins

stuck on with wax. On which rod will

the pins fall off first and why?



Exercise 1: Conduction Results

1. Which rod became warmer fastest, wood or copper?

2. What does this tell you?

3. Which rod became warmer fastest, iron or copper?

4. What does this tell you?

5. Why did the ice not melt quickly?

Copper rod became warmer faster

Copper is a better conductor of heat than wood, metals are better

conductors than non-metals

Copper

Different metals conduct heat at different rates

Water (liquids) are poor conductors of heat



Conduction

Read Exploring Science 1 p136 -137

Copy you should know box p137

Answer Q 1 to 4

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Energy - Conduction