Question

Name any one electrical device in your home in which thermonst is used. Explain the woring principle of thermostat used in heating devices with the help of suiable diagram can a bimetallic strip made of brass and silver be used in thermostat? Give reson for your answer.

Answer 1

Hey !
Thermostat is a device which is used to maintain a desired temperature in a system like refrigerator, air-conditioner,iron and in a number of devices.

Thermostat works on the principle of thermal expansion of solid materials.

Bimetallic strips Thermostat

A traditional thermostat has two pieces of different metals bolted together to form what’s called a bimetallic strip (or bimetal strip). The strip works as a bridge in an electrical circuit connected to your heating system. Normally the “bridge is down”, the strip carries electricity through the circuit, and the heating is on. When the strip gets hot, one of the metals expands more than the other so the whole strip bends very slightly. Eventually, it bends so much that it breaks open the circuit. The “bridge is up”, the electricity instantly switches off, the heating cuts out, and the room starts to cool.

But then what happens? As the room cools, the strip cools too and bends back to its original shape. Sooner or later, it snaps back into the circuit and makes the electricity flow again, so the heating switches back on. By adjusting the temperature dial, you change the temperature at which the circuit switches on and off. Because it takes some time for the metal strip to expand and contract, the heating isn’t constantly switching on and off every few seconds, which would be pointless (and quite irritating); depending on how well-insulated your home is, and how cold it is outside, it might take an hour or more for the thermostat to switch back on once it’s switched off.

Answer 2

Thermostat is a type of device which is used to hold a proper and prominent temperature in a machine especially which uses aerosols.

It works on the principle of thermal expansion of solid, liquids and gases.

Thermostats uses a type of sensor to measure the temperature. A bimetallic strip directly functionalizes electrical conductions that control the heating or cooling process and transfers or converts one energy to the other.

A thermostat is called a "bang-bang controller" as the process of heating or cooling are disefficiently different in the conversion duration and cannot be controlled by other process. Though exceptions are always there.