R-Value and U-Value

What is the R-value of a window with a U-factor of 0.25?

• 2

• 3

• 1

• 4

Tags

NGSS.HS-PS3-4

What is the R value if the U value is 0.0833?

• .0833

• 1/12

• 12

• .08333/1

Increasing the thickness of an insulating layer

• Increases the thermal resistance

• decreases the thermal resistance

• doubles the thermal resistance

• does not affect the R-value

If a material has an R-value of 49, what is its U-factor

• 3.33

• 0.002

• 0.02

• 4.9

Tags

NGSS.HS-PS3-4

How do you determine the U-factor for a building assembly

• Add U - factors and divide by 1

• Divide 1 by the total of the R- values

• Add U -factors of components

• Add inverse R values together

What does R-value mean in insulation?

• indicates the resistance to heat flow

• indicates the resistance to cool air flow

• indicates the room temperature

• it is the value or degree that the house will stay

Tags

NGSS.MS-PS3-3