Insulation

Which of the following would reduce the dissipation of energy from a house to the surroundings?

• insulation

• large walls

• thin walls

• metal walls

Tags

NGSS.HS-ETS1-3

Dissipated energy is always

• wasted energy

• useful energy

• thermal energy

• chemical energy

Tags

NGSS.HS-PS3-4

What is an insulator?

• Something that keeps objects warm

• Something that stores thermal energy

• Something that slows the transfer of thermal energy

• Something that allows the transfer of thermal energy

Tags

NGSS.MS-PS3-3

How does most insulation in the home work?

• The insulating material has a vacuum that doesn't allow conduction or convection to occur

• The insulating material has trapped air pockets that slows conduction and convection from occurring

• All the insulating material is put at the top of the house because heat rises

• All the insulating material is put in the walls because they have a large surface area

Tags

NGSS.HS-PS3-4

People sometimes put foil behind radiators...

• ...to reflect the infrared radiation back into the room

• ...because who wouldn't want a bit of bling behind their radiator?

• ..to absorb the dissipated heat

• ...to stop the walls getting damaged by the heat

Tags

NGSS.HS-PS3-4

Effective house insulation...

• ...has a low U-Value

• ...has a high U-Value

Calculate the payback time for double glazed windows that cost £1800 to install and save £150 on heating bills

• 14.4 months

• 22.5 years

• 0.083 years

• 12 years

Calculate the cost of cavity wall insulation if the payback time is 10 years and it saves the customer £120 per year

• £14,400

• £1200

• £830

• £1.20

Double glazing works by...

• Setting up a convection current in the gap between the windows that stops thermal energy transfer

• A layer of foam between two window panes traps air and stops conduction and convection

• Thick layers of glass ensure that conduction takes longer so it slows the rate of thermal energy transfer

• A trapped layer of air between two window panes stops conduction and convection

Installing insulation...

• keeps your house warm in the winter and cool in the summer

• only keeps your house warm in the winter

• only keeps your house cool in the summer

• keeps your house cool in the winter and warm in the summer

Tags

NGSS.HS-PS3-4