P1b-keeping Homes Warm

Question 1

How do different surfaces react to infrared radiation?

Answer 1

Reflected by shiny surface

Absorbed by dull or rough surface

Question 2

How is energy transferred by conduction?

Answer 2

Vibrating particles pass on extra kinetic energy to other particles
Free electrons make transferring energy faster

Question 3

How is energy transferred by convection?

Answer 3

When more energetic particles move from the hotter region to the cooler region taking their heat energy with them
Liquid/gas less dense when heated

Question 4

What is infrared radiation?

Answer 4

An electromagnetic wave and needs no medium

Question 5

Why is trapped air in a material a very good insulator?

Answer 5

Blankets clothes trap pockets of air

Air cant move so heat has to conduct slowly through pockets of air and material in between

Question 6

What are some ways to insulate your home?

Answer 6

Loft insulation-reduces conduction
Double glazing-reduces conduction
Cavity wall insulation-reduces conduction and convection
Curtains-reduces conduction and radiation
Draught proofing

Question 7

What is the equation for payback time?

Answer 7

Initial cost / annual savings

Question 8

What does the thickness of the arrow in a sankey diagram represent?

Answer 8

The amount of energy