Thermal energy transfers

What is conduction?

• The transfer of heat energy through a material by movement of the material itself.

• The transfer of heat energy or electrical energy through a material without the material itself moving.

When your finger touches a metal, heat is conducted out of your finger and into the metal. Because metal is a good ________________.

• insulator

• conductor

• conduction

• convection

In a metal there are particles called _________ that can move freely.

• atoms

• protons

• electrons

• neutrons

What is convection?

• The transfer of heat energy through a material by movement of the material itself.

• The transfer of heat energy or electrical energy through a material without the material itself moving.

What is radiation?

• The energy spreading out from a source carried by particles or waves.

• Electromagnetic radiation whose wavelength is greater than that of visible light.

Which is a better absorber of infrared radiation?

• Matt black surface

• Shiny black surface

Which is a better emitter of infrared radiation?

• Matt black surface

• Shiny black surface

Which is a better reflector of infrared radiation?

• Matt black surface

• Shiny black surface

Explain how it reduces heat loss, refer to conduction, convection or radiation. Heavy curtains, when closed, trap air next to a window.

• Conduction

• Convection

• Radiation

Explain how it reduces heat loss, refer to conduction, convection or radiation. Shiny metal foil is fitted in the loft, covering the inside of the roof.

• Conduction

• Convection

• Radiation