How does an airconditioner, and refrigerater use electricity to creat a cool/freezing temperature?

Question

How does an airconditioner, and refrigerater use electricity to creat a cool/freezing temperature?

Answer 1

The air conditioner uses electricity to drive a compressor, which effectively is a pump. They pump the gas through a restriction which increases the flow rate and lowers the pressure. This causes the gas temperature to drop. Then the cold gas runs to the area to be cooled and the heat in that area transfers to the gas and the warmer gas runs to the radiator where an electrical fans blows air through to cool the gas down before it gets pumped through the restriction again by the compressor.

Then you use an electrical circuit to measure the temperature and switch the compressor and fan on and off when required.

Answer 2

If you use electricity to compress a gas and take away the heat generated, then when the compressed and cooled gas is expanded, it will take heat out of the environment.  So you compress the gas outside and use the finned pipes and fan to blow off the extra heat and carry the liquid inside and expand it in the coil in the air stream.   In a refrigerator, the hot coils are on the back or under the bottom and the cold part is inside the frig.