Answer:
Explanation:
A <em>thermostat </em>is an electromechanical device to control or regulate the on anf off of the heaters.
The operation of the thermostats is based in the expansion (dilation) of the metals: the dimensions of the metals change with the temperature.
A bimetallic strip is an elongated piece formed by two metal strips. Like every metal has its own linear expansion coefficient, two different metals will expand at a different rate when are exposed to the same change of temperature.
So, two metal strips can act like a switch: when they are in contact the current flow and the system is on, when they are separated the flow of current stops and the system is off.
Then, the bimetallic is prepared in such a way that when the temperature is low the two pieces are in contact and the heater heats, but when the temperature has reached some temperature the strips elongate different amounts and they get separated, the flow of current in the system stops, and the heater stops heating.
