At low temperatures, by means of negative feedback mechanism, the thermostat completes the circuit, while at high temperature the thermostat disconnects the circuit.
What is a negative feedback mechanism?
A negative feedback mechanism is a mechanism which uses a product of its forward reaction to stop further reaction.
In a thermostat, the heat produced from the room at high temperature melts or disconnects a given point in the circuit, thus making sure that temperature is not too high.
At low temperature, the point is reconnected thereby getting up the room.
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