Furnace Device: Answers & Solutions

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The discussion focuses on understanding a furnace device involving two different metal strips, labeled AB, which are welded together. When temperature changes, these strips bend due to differing expansion rates, allowing them to touch a component in the diagram. This bending action amplifies small changes in length caused by temperature fluctuations from the furnace's heat. The use of two metals is crucial as their distinct thermal expansion properties enhance the device's sensitivity. Overall, the mechanism relies on the physical properties of the metals to function effectively in response to temperature variations.
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Homework Statement


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The Attempt at a Solution


I do not understand the diagram.
 

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