What is bimetallic strip how it is used in thermostats?
Bimetallic strips 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.
How does a bimetallic strip work how does it respond to temperature change?
When a steel strip is combined with either a copper or a brass strip, the combination responds to heating by bending in the direction of the lesser coefficient of thermal expansion. With applied heating, the structure bends toward the steel. Bimetallic strips can be made quite physically long versus their width.
What happens when temperature rises in bimetallic strip?
Constructions of Bimetallic Thermometer. The bimetallic strip is constructed by bonding together the two thin strips of different metals. Thereby, the length of metals changes at different rates. When the temperature increases, the strip bends towards the metal which has a low-temperature coefficient.
Is bimetallic strip a temperature sensor?
The Bimetallic strip is a mechanical temperature sensor element. It converts temperature to a mechanical displacement. This displacement may be coupled to a switch for simple on-off function, to a needle of an indicator, or to a position detector for electronic output.
What are some applications of bimetal strips?
Applications
- Clocks.
- Thermostats.
- Thermometers.
- Heat engine.
- Electrical devices.
Why does a bimetallic strip bend when the temperature changes explain and give an example of where bimetallic strip is applied?
Such as thermometers, clocks, and other electrical devices. The strip of bimetal comprises two metals with different coefficients of thermal expansion. When the bimetallic strip is heated, the metal with higher thermal expansion will bend more. Thus they bend towards the metal having a lower thermal expansion.
Why does the strip bend when heated?
The bimetallic strip However, after heating (below), the yellow metal expands more, so the strip bends. A bimetallic strip is made of two separate strips of metal stuck together. These two strips expand to a different extent when heated. So, when the strip is heated, one strip will be longer than the other.
What is a bimetal device and how does it operate?
The bimetal thermometer measures by thermal expansion. A bimetal thermometer uses a bi metal spring as temperature sensing element. This technology uses a coil spring made of two different types of metals that are welded or fastened together. These metals could include copper, steel, or brass.
What is bimetal material?
Bimetal 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. A bimetal bar is usually made of brass and iron.