figure 3: Fire alarm. This results in the bimetal curving (or curling) in one directionjust like the ribbon for the gift wrap. It is because the temperature change will bring the mechanical displacement in the metal. From there, it flows back through a copper tube into your home and into the expansion valve located in the indoor unit near the evaporator coil. Smoke detectors are common household items that keep you and your family safe by alerting you to smoke in your home. Performance cookies are used to understand and analyze the key performance indexes of the website which helps in delivering a better user experience for the visitors. Why? Necessary cookies are absolutely essential for the website to function properly. Bimetallic strips are used as switches in thermostats. It is because the temperature change will bring the mechanical displacement in the metal. Which is the most effective way to prevent viral foodborne illnesses? What happens to bimetallic strip when heated? The expansion results in bending. The cookie is set by GDPR cookie consent to record the user consent for the cookies in the category "Functional". Thermal expansion is the tendency of matter to change in shape, area, and volume in response to a change in temperature. The cookie is used to store the user consent for the cookies in the category "Analytics". Bimetal strips are used in miniature circuit breakers to protect circuits from excess current. why does a bimetallic strip curve when it is heated or cooled? What do you do if the gas meter is not working? When heat is applied to the coiled bimetallic strip, it expands and uncoils. :-(. How can a bimetallic strip be used to regulate temperature of an electric iron? On the other hand, when a material is cold, molecules move less, which makes them take up less space. This cookie is set by GDPR Cookie Consent plugin. a strip consisting of two metals of different coefficients of expansion welded together so that it buckles on heating: used in thermostats, etc. A bimetallic strip is used to convert a temperature change into mechanical displacement. No tracking or performance measurement cookies were served with this page. Therefore, the bimetallic strip will bend. At this stage, the pointer records the temperature reading. And if the strip is cooled, metal B will be on the outside. When a bimetal is heated One of the metals will expand more than the other. Why does a bimetallic strip bend when the temperature changes explain and give an example of where bimetallic strip is applied? The bimetallic strip was used in thermostats. For energy savings, turn the temperature down 1 or 2 degrees at a time. The cookie is used to store the user consent for the cookies in the category "Other. In effect, the temperature change is converted into mechanical displacement. When the bimetallic strip is heated, the metal with higher thermal expansion will bend more. When a bimetal is heated one of the metals will expand more than the other. When the same amount of water is heated or cooled, its density changes. Case(i): When the temperature increases, it allows the strip to expand towards the metal with a lower value of temperature coefficient, which can be observed in the figure below. The bimetallic strip is a piece of metal made by laminating two different types of metal together. It consists of a spiral-like structure and a pointer is attached to it, which is used for scaling the temperature. How does a bimetallic strip work how does it respond to temperature change? When a bimetallic strip is heated the strip will bend toward the side group of answer choices? 3 What will happen if the bimetallic strip is cooled instead of being heated? What happens when a bimetallic strip is heated? These cookies ensure basic functionalities and security features of the website, anonymously. Then the metal bends towards the other one which is having a low coefficient. 1 Why does a bimetallic strip curve when it is heated or cooled? Gases expand the most upon heating because the intermolecular space is more than in solids or liquids. When a resistance indicating a particular temperature is reached, the heating elements is switched on or off. The cookie is set by GDPR cookie consent to record the user consent for the cookies in the category "Functional". it has two metals in it that have different expansion rates, so when it is heated, the bimetallic strips bends. When one strip gets longer than the other, the. The bimetallic strip was used in thermostats. Two commonly used metals are brass and steel. 1 What would happens to a bimetallic strip when heated? The strip consists of two strips of different metals which expand at different rates as they are heated. What will happen if the bimetallic strip is cooled instead of being heated? This bimetallic strip is connected to a contact spring by small pins. This cookie is set by GDPR Cookie Consent plugin. These strips are often used in thermostats Brass and Iron together form the bimetallic strip. These cookies will be stored in your browser only with your consent. Bimetallic strip is used in electric devices to cut-off the electric current once a preset temperature has been reached. They are available in two forms helical and spiral form. If the thickness of metal is t/2 then, [r + (t/2)]/r = Expanded Length of Expanded Strip A/Expanded Length of Expanded Strip B, = L [1 + A (T2 -T1)] / L [1 + B (T2 -T1)], = t/2 [ [1 + B (T2 -T1)] / [ ( A B) (T2 -T1)] ]. The two metals that . These cookies track visitors across websites and collect information to provide customized ads. The cookie is used to store the user consent for the cookies in the category "Other. Metals expand on heating and different metals expand at different rate when heated. What is the difference between products based company and service companies? These cookies ensure basic functionalities and security features of the website, anonymously. again when it is warmer. At this stage, the pointer records the temperature on the scale. The cookie is used to store the user consent for the cookies in the category "Performance". A bimetallic strip is made of two different kinds of metals that are laminated into one strip. The site owner may have set restrictions that prevent you from accessing the site. When temperatures decrease, objects condense and become smaller so density increases. A bimetallic strip controls the thermostat. When a bimetallic strip is heated, it Bend in the form of an arc with the more expandable metal outside as shown in figure. When the bimetallic strip is heated, the metal with higher thermal expansion will bend more. if a straight bimellalic strip is cooled i. Most matter expands when heated And contracts when cooled, a principle called thermal expansion. Why does a bimetallic strip bend when cooled? When heat is applied to the coiled bimetallic strip, it expands and uncoils. Where helical bimetallic strip thermometer is used in industrial areas, and the spiral bimetallic thermometer is used in less sensitive areas. When applying temperature to these materials, then they will . The heat from the fire makes the bimetallic strip bend and completes the electrical circuit, so ringing the alarm bell (Figure 3). When this bimetallic strip is heated, the brass expands more than the steel and the strip curves with the brass on the outside. The cookie is used to store the user consent for the cookies in the category "Performance". When the temperature is lower than normal room temperature, the length of the brass will be less than the length of the iron, and so the bimetallic strip will become U-shaped with the brass on the topside. Requested URL: byjus.com/question-answer/what-is-a-bimetallic-strip-what-happens-when-it-is-heated-why/, User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/103.0.5060.114 Safari/537.36 Edg/103.0.1264.49. Patterns of problems. And if the strip is cooled, metal B will be on the outside. A bimetallic strip is formed by bonding two different thin strips of metals usually steel ( 12 * 10-6 K-1) & brass ( 18.7 * 10-6 K-1), or copper ( 16.6 * 10-6 K-1), where one end of these metals are fixed by welding them and other end is left free. Thermometer and thermostat are examples of bimetallic tip devices. Advertisement Answer 4 people found it helpful riya329459 Answer: Bimetallic Strip. The world's only live instant tutoring platform. bimetallic strip in British English noun. Other uncategorized cookies are those that are being analyzed and have not been classified into a category as yet. A bimetallic strip compromises of two strips of two different metals. Copyright 2023 Quick-Advices | All rights reserved. When the temperature rises, the strip will turn in the direction of metal with the lower temperature coefficient. When the temperature inside the refrigerator rises, the bimetallic strip bends to switch on the compressor which starts the cooling cycle. Thus they bend towards the metal having a lower thermal expansion. When the strip is cold, This makes the molecules spread out and take up more space. When the strip touches that contact, it completes a circuit that triggers the alarm to sound. And if the strip is cooled, metal B will be on the outside. When heat is applied to the coiled bimetallic strip, it expands and uncoils. How does a fire alarm with a bimetallic strip work? Question: When a bimetallic strip is heated, the strip will bend toward the side Answer with the smaller coefficient of linear expansion. A bimetallic strip of steel and brass will thus bend Toward the steel upon heating and toward the brass upon cooling. As a piece of metal with a hole in it is heated, the hole A. becomes larger B. becomes smaller C. stays the same . . Each metal responds to heat and cold by expanding a specific amount based on the change in temperature. A thermostat keeps the temperature of a room or an appliance constant. However, you may visit "Cookie Settings" to provide a controlled consent. However, since Brass expands (or contracts) more than iron when its temperature is raised (or cooled), the bimetallic strip will bend one way or another depending on the temperature being above or below room temperature. Bimetallic strips are used as switches in thermostats. The strip consists of two strips of different metals which expand at different rates as they are heated. This consists of a strip of brass in contact with a strip of iron. What happens to the density of a substance when it expands? why are concrete sidewalds made in small sections rather than in one long continuous piece? Bimetallic Strip. A bimetallic strip is made of two different kinds of metals that are laminated into one strip. This cookie is set by GDPR Cookie Consent plugin. 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 following are the advantages of the bimetallic strip, The following are the disadvantages of the bimetallic strip, The following are the applications of the bimetallic strip. 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