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The R-Value of an Insulating Material Is the Thickness of the Material

Question 6

Multiple Choice

The R-value of an insulating material is the thickness of the material divided by its thermal conductivity. When an insulating material consists of three layers with R-values R1, R2 and R3, the overall R-value of the insulation is given by


A) R = R1 + R2 + R3.
B)
The R-value of an insulating material is the thickness of the material divided by its thermal conductivity. When an insulating material consists of three layers with R-values R<sub>1</sub>, R<sub>2</sub> and R<sub>3</sub>, the overall R-value of the insulation is given by A) R = R<sub>1</sub> + R<sub>2</sub> + R<sub>3</sub>. B) . C) . D) . E) . .
C)
The R-value of an insulating material is the thickness of the material divided by its thermal conductivity. When an insulating material consists of three layers with R-values R<sub>1</sub>, R<sub>2</sub> and R<sub>3</sub>, the overall R-value of the insulation is given by A) R = R<sub>1</sub> + R<sub>2</sub> + R<sub>3</sub>. B) . C) . D) . E) . .
D)
The R-value of an insulating material is the thickness of the material divided by its thermal conductivity. When an insulating material consists of three layers with R-values R<sub>1</sub>, R<sub>2</sub> and R<sub>3</sub>, the overall R-value of the insulation is given by A) R = R<sub>1</sub> + R<sub>2</sub> + R<sub>3</sub>. B) . C) . D) . E) . .
E)
The R-value of an insulating material is the thickness of the material divided by its thermal conductivity. When an insulating material consists of three layers with R-values R<sub>1</sub>, R<sub>2</sub> and R<sub>3</sub>, the overall R-value of the insulation is given by A) R = R<sub>1</sub> + R<sub>2</sub> + R<sub>3</sub>. B) . C) . D) . E) . .

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