Question

Explain the working principle of thermostat used in heating devices with the help of suitable diagram. Give resons for your answer.

Answer 1

So how does a thermostat work? Most things get bigger when they heat up and smaller when they cool down (water is a notable exception: it expands when it heats up and when it freezes too). Mechanical thermostats use this idea (which is called thermal expansion) to switch an electric circuit on and and off. The two most common types use bimetallic strips and gas-filled bellows.

https://cdn4.explainthatstuff.com/how-bimetal-thermostat-works.gif

Answer 2

check the textbook the answer must be there