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A thermostat is just a device that keeps the temperature of something constant. They are probably most commonly encountered as part of a central heating or air conditioning unit in your home or office. Thermostats can operate in a range of ways but more often than not they will use a combination of two metals. As temperature changes the electrical properties of these metals change (see Ohm's law). Because the two metals change at different rates they can be compared with each other to establish the temperature - different metal pairings are used for different temperature ranges. The temperature data is then sent through an electrical signal to a boiler or air conditioning unit which will heat or cool the room as required.

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Q: Where is a thermostat wired to. And what part of the system will it effect to operate?
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