What is a bimetallic strip and how does it work?

What is a bimetallic strip and how does it work?

A bimetallic strip is used to convert a temperature change into mechanical displacement. The strip consists of two strips of different metals which expand at different rates as they are heated.

What does the bimetallic strip do in a thermostat Why?

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. Eventually, it bends so much that it breaks open the circuit.

What kind of expansion takes place in bimetallic strip?

thermal expansion
Definition: A bimetallic strip works on the principle of thermal expansion, which is defined as the change in volume of metal with the change in temperature. The bimetallic strip works on two basic fundamentals of metals.

How does a bimetal strip works?

The bimetallic strip consists of two thin strips of different metals, each having different coefficients of thermal expansion. When the temperature decreases, the strip bends in the direction of metal having a higher temperature coefficient. The deflection of the strip indicates the temperature variation.

How does a bimetal strip operate?

The bimetallic strip constitutes one of the most trouble-free and durable thermometers. It is simply two strips of different metals bonded together and held at one end. When heated, the two strips expand at different rates, resulting in a bending effect that is used to measure…

On what principle does a bimetal strip operate?

Bimetal thermometers work on the principle that different metals expand at different rates as they are heated. By using two strips of different metals in a thermometer, the movement of the strips correlates to temperature and can be indicated along a scale.

How does a bimetallic strip work in a fire alarm?

When the strip is heated by fire, the high-expansion side bends the strip toward an electrical contact. When the strip touches that contact, it completes a circuit that triggers the alarm to sound. The width of the gap between the contacts determines the temperature that will set off the alarm.

How does a bimetallic strip works?

Why metal strips are used for?

When bimetallic strip is heated, the bress expands more than the steel the strip curves with the brass on the outside. If strip is cooled, it curves with the steel on outside and can be used in thermostat, as a switch or in metal thermometers.

How bimetallic strip is formed?

A bimetallic strip is formed out of two identical strips one of copper and the other of brass.

What are the fundamentals of the bimetallic strip?

The bimetallic strip works on two basic fundamentals of metals. The first fundamental is the thermal expansion, which states that the metals expand or contract based on variation in temperature

How does a bimetallic strip convert thermal energy?

A bimetallic strip converts thermal energy into mechanical displacement. What is Bimetallic Strip? Definition: A bimetallic strip works on the principle of thermal expansion, which is defined as the change in volume of metal with the change in temperature. The bimetallic strip works on two basic fundamentals of metals.

Why is a bimetallic strip used for thermometers?

When a bimetallic strip with brass and steel is heated, the brass will expand more the steel, causing the strip to curve with the brass on the outside. When the steel is cooled, it will curve with the steel on the outside. This works well in thermometers to help demonstrate the mercury rising as temperatures go up.

What are the disadvantages of bimetallic strip work?

Disadvantages of bimetallic strips It is less accurate It is limited to applications where manual reading is acceptable, e.g. a household thermometer. It is not suitable for very low temperatures because the expansion of metals tend to be too smaller.