can u give information in detail how a thermostat works?

Answer 1

A thermostat is a device for regulating the temperature of a system so that the system's temperature is maintained near a desired setpoint temperature. The thermostat does this by controlling the flow of heat energy into or out of the system. That is, the thermostat switches heating or cooling devices on or off as needed to maintain the correct temperature.

Thermostats can be constructed in many ways and may use a variety of sensors to measure the temperature. The output of the sensor then controls the heating or cooling apparatus.

Common sensors include:

* Bi-metal mechanical sensors
* Expanding wax pellets
* Electronic thermistors
* Electrical thermocouples

These may then control the heating or cooling apparatus using:

* Direct mechanical control
* Electrical signals
* Pneumatic signals

On a steam or hot-water radiator system, the thermostat may be an entirely mechanical device incorporating a bi-metal strip. Bi-metal refers to an object that is composed of two separate metals joined together. Instead of being a mixture of two or more metals, like alloys, bimetallic objects consist of layers of different metals. Trimetal and tetrametal refer to objects composed of three and four separate metals respectively.
Bi-metallic strips and disks, which convert a temperature change into mechanical displacement, are the most recognized bimetallic objects due to their name.
The power through the thermostat is provided by the heating device and may range from millivolts to 240 volts in common North American construction, and is used to control the heating system either directly (electric baseboard heaters and some electric furnaces) or indirectly (all gas, oil and forced hot water systems). Due to the variety of possible voltages and currents available at the thermostat, caution must be taken.

Answer 2

A thermostat is a device that senses an actual temperature and compares it with a desired temperature. If there is a significant difference between the two, the thermostat initiates an action that will attempt to reduce the difference to an acceptable value.
For example, your house probably has a thermostat on an inside wall. You may be able to dial in a desired temperature on a Gage or a digital readout. If the actual temperature is lower than this, the thermostat may close an electrical relay which may cause the furnace to come on.
The actual sensing mechanism can take many forms but one of the most common is a mercury switch that is connected to a temperature sensitive bimetallic coil. When the temperature changes the two metals in the coil expand at different rates and cause the coil to rotate the switch so that a glob of mercury makes or breaks a circuit.

Answer 3

It's very simple. Different metals expand and contract at different rates when exposed to heat and cold. Thermostats are controlled by bimetallic strips (different metal on either side). When a certain temperature is reached the contact is broken by the contraction/expansion of the metal.

Answer 4

I'm no expert but I think they are mostly bimetallic strips, two strips of metal with different contraction and expansion rates. When the temp. chages, the strip bends and either makes or breaks a contact. The other form of thermostat is of a substance that melts at a particular temp which triggers the response.

Answer 5

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