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Metals expand when heated and contract when cooled. Different metals expand & contract by different amounts. Rivet together a metal that changes a lot to another metal that doesen't change as much. Then when they are expanding/contracting the composite strip ends up bending up/down. They can actually bend quite a lot and can easily be used to trigger an on/off switch.
Wiki User
∙ 15y ago
Wiki User
∙ 15y agoUsually just as a switch. The different metals in the strip expand at different rates, so when the strip heats up it bends one way and opens an electrical contact turning the heater (or vent, or valve, or whatever) off, when it cools off enough it bends the other way and completes the connection turning the heater on.
Wiki User
∙ 14y agoThe bimetalic strip is two dis-similar metal that expand/contract at different rates in conjunction with the ambient temperature... The strip is usually wound in a circular form with one end sticking out... This sticking out end is adjusted left/right by means of an attached lever... As the temperature change the bimetalic strip bends in either a left or right ( winds the coil tighter ) direction until it comes into contact with a conductor/trigger. This completes an electrical circuit and causes the heat to turn on until the strip is warmed enough to bend the other way and break the contact.
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How do you make a circuit using bimetallic strip?
The bimetallic strip is made of two different metals, bonded together. The two metals have different temperature expansion coefficients, so when the bonded assembly is heated or cooled, it curves one way or the other, allowing a switch to be opened or closed.
What does the bimetallic strip in an electric iron do?
It is used as a thermostat.A thermostat is a device used to control the temperature of any equipment, in this case an electric iron.Two little strips of different types of metals are welded or brazed together. These little strips will be mounted inside the the iron near to the hot plate, held down just at one side.An electrical contact will join the bimetallic strip into the electrical circuit of the iron. Another little flat metal plate will be mounted near the free end of the bimetallic strip. This little fixed plate will touch the free end of the bimetallic strip.So now you turn the iron on. The irons' hot plate heats up. The bimetallic plate heats up too as it is close to the hot plate.Ok, now is the clever bit someone once thought out. The two strips of metal heat up and expand. As the properties of the metals are different they will expand at different amounts. As the two strips are stuck together the bimetallic strip will bend.When it bends it will eventually bend away from the fixed plate. Assuming its been installed with the bimetallic strip the right way around! because the strip will bend to the side which has the metal that expands less. When it no longer touches the plate the circuit will turn off. And hence the power is turned off to the iron.So how come that dial makes the iron hotter or less hot? When you are twisting the dial you are actually squeezing some tension into the bimetallic strip so that it will have to get hotter before it will bend away from the contact and hence break the circuit.Thats the idea!
Any 5 gadgets in which bimetallic strip is used?
They're all thermostats of on kind or another: home, car, stove, hot-water heater,
What is a thermostat?
Thermostats are used to measure temperature in a room or appliance (ex.furnace). Thermostat act as temperature regulators which can turn appliances on or off at a predetermined temperature. Thermostats use the contraction of solids to measure temperature. Thermostats contain a strip made of two metals (bimetallic strip) that expand or contract depending on whether they are heated or cooled. When the metal expands or contracts it bends. The amount that the metal bends depends on the temperature. The bending provides a measure of the temperature.== Answer == A thermostat is a device used to tell temperatures.orit's an electrical switch that responds to temperature.It is a devise that controls the temperature of an item or system.Maintains predetermined temperature of engine coolant.
How could a bimetallic strip perform a practical task in life?
bimetal stip is next to the contacts it make your oven,iron and air conditions unit work that is when ever the contacts touch from how high you put it and it heat up and the iron and brass bends
What is a use of a bimetallic strip in everyday life?
thermostat
Name the gadgets in which bimetallic strip is used?
conversion calculator thermostat
What is the device used in thermostat?
Bimetallic strip
Why are bimetallic strips used in thermostats?
The two metals chosen for the bimetallic strip have different modulii of thermal expansion, The bimetallic strip bends as the temperature changes and so the strip can be used to activate relays or other electronic switches and so work as a thermostat.
What happens when bimetallic strip is heated?
The bimetallic strip bends.
What is bimetallic strip made of?
A bimetallic strip is made out of steel and iron
What is a bimetallic strip and where can it be used?
A bimetallic strip is a strip with two metals bonded together. It can be found in thermostats
How is a bimetallic strip used in a thermostat?
A bimetallic strip is used in a thermostat, by concealing it inside. When the temperature goes up, the bimetallic strip expands, and turns on the circuit for the AC/compressor ,to make the temperature cooler inside wherever the thermostat is.Two metal strips of differing thermal expansion are bonded together. Because the expansion is different the metals expand by different amounts. When heated the strip therefore has to bend, the one with the greater expansion on the outside of the curvature. As the strip bends it can either make or break a circuit contact depending on the configuration of the circuit, switching on of off the current. The reverse is true when the strip cools again.
Which two metals are used in bimetallic strip?
A bimetallic strip is made out of copper and steel.
Where can a bimetallic strip can be found?
In a thermometer,thermostat,clock or oven You can refer to wikipedia.:)
What is the Operating principle of a bimetallic strip?
A bimetallic strip is used to convert a temperature change into mechanical displacement.
How does bimetallic work in an electric iron?
A bimetallic strip is a strip made from 2 different metals. It is designed to bend one way if it is warm and the other way if it is cold. The hotter it gets, the more it bends. In any thermostat, the electrical contacts bend apart as the target temperature is reached. The only difference between a heating thermostat and a cooling thermostat is which side of the bimetallic strip faces the other contact. In a heating appliance, the thermostat knob turns a screw to add resistance to the motion of the contacts so they must get hotter to separate as the screw is tightened. So the tighter the screw is turned, the hotter the appliance is allowed to get before the contacts separate.
