Question

1. A wall is made up of four elements, as follows:

Answer 1

Part A)

Since all four resistors are made up of different elements and connected in series

SO in series the net resistance is given by

$R = R_1 + R_2 + R_3 + R_4$

$R = 0.81 + 0.62 + 10.9 + 0.45$

$R = 12.78$

Part B)

If insulation is removed then resistance due to three materials

$R = R_1 + R_2 + R_3$

$R = 0.81 + 0.62 + 0.45$

$R = 1.88$

Part c)

Heat will always flow from High temperature to low temperature

So here heat flow is from 90 degree F to 70 degree F

so it will flow from outside to inside