A thermostat is made up of three main parts: ____ – This is the part of the thermostat that you see. It is usually a knob or button that is used to adjust the ____ of the appliance. ____ – This is a ____ strip, made of two ____, which switches the appliance on and off. ____ – These make the connection between the bimetallic strip and the ____ of the appliance. The ____ is made up of two strips of different metals ____ or riveted together. These two metals ____ by different amounts when they are ____. They will also ____ by different amounts when they ____. ____ (an alloy of copper and zinc) and ____ are two metals commonly used to make bimetallic strips, because brass expands more than iron when heated and contracts more when cooled.

Temperature control in household appliances

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