Furnace Device: Answers & Solutions

[jimbo71]

Homework Statement

see attachment

Homework Equations

The Attempt at a Solution

I do not understand the diagram.

 

[Redbelly98]

The two lines labelled AB are actually strips of two different metals, attached to each other (usally be welding them together, I think)

When the temperature changes, the metal strips curve or bend to the right and touch the thing in the upper right of the figure.

 

[jimbo71]

So, they expand and contract which is determined by the temperature from the heat given off from the furnace. Why are two different metals used?

 

[mgb_phys]

They expand different amounts with temperature and so bend - the bending amplifies the very small change in length.