8Kd Power and efficiency

A material that does not conduct heat or electricity is called an...

• Conductor

• Insoluble

• Insulator

• Brick

An example of a good conductor is

• Plastic

• Wood

• Fleece

• Metal

Metal is a good conductor because it

• Has a shiny surface

• Is malleable

• Contains free electrons

• Is strong

The only form of heat transfer that can cross a vacuum is...

• Conduction

• Radiation

• Convection

• Sound

Tick the methods of reducing heat transfer from a hot cup of coffee

• Wrap it in metal

• Wrap it in cotton wool

• Put it in a vacuum

• Place the cup in a hot place

A cold object is placed in a warm room. Which direction will the energy transfer

• From the cold object to the warm room (cold to hot)

• From the warm room to the cold object (hot to cold)

When you go out on a cold day, how does a thick coat help keep you warm? Explain your answer.