why is alloys used in electrical heating devices?
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Alloys are used in electrical heating devices rather than pure metals because the resistivity of an alloy is more than the resistivity of a pure metal. Moreover alloy does not burn (or oxidize) easily even at higher temperature.
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Why? Metals are an excellent conductor of electricity and heat because the atoms in the metals form a matrix through which outer electrons can move freely. Instead of orbiting their respective atoms, they form a sea of electrons that surround the positive nuclei of the interacting metal ions.
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It is most notably used in the semiconductor industry, in low-melting-point metal alloys such as solders, in soft-metal high-vacuum seals, and in the production of transparent conductive coatings of indium tin oxide (ITO) on glass. Indium is considered a technology-critical element.
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Copper and aluminium are most frequently used as the electrical conductors in electrical cables due to their low resistance and excellent conductivity. These metals are both ductile and relatively resistant to corrosion, but they also have different properties which make them useful for various applications.
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The next advantage stainless steel has as a radiator material is that it's an efficient conductor of heat. Plus stainless steel radiators retains heat longer than aluminium items. This means they keep you home warmer for longer after you switch off your central heating.
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c]low conductivity,hogh melting point. d]low resistivity,high melting point. e]high resistivity,high melting point. The heating element must have high-melting point so that it can withstand for high temperature and even a little raise in temperature will not damage the heating element of the heater.
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Properties of metals. ... They are electrical conductors because their delocalised electrons carry electrical charge through the metal. They are good conductors of thermal energy because their delocalised electrons transfer energy.
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Most metals are good conductors of heat. ... The reason that metals are good conductors of electricity and heat is due to the nature of the metallic bonds in metals, and the behavior of valence shell electrons in metal atoms.
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The transition metals bridge elements that fall on either side of them. These elements conduct electricity and heat; they form ions with positive charges. Their malleability and ductility make them ideal materials for the manufacture any type of metal-based item.
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They are good conductors of thermal energy because their delocalised electrons transfer energy. They have high melting points and boiling points , because the metallic bonding in the giant structure of a metal is very strong - large amounts of energy are needed to overcome the metallic bonds in melting and boiling.
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To avoid the risk of electric shock metal body of an electric appliances is earthed. ... Thus, it ensures that any leakage of current to the metallic body of appliance keep its potential to that of the earth and a user may not gets the severe electric electric shock.
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Hair dryers use a metal heating element that is made of nichrome, an alloy of nickel and chromium. Unlike other electrical wires made of copper, nichrome will not rust at high temperatures.
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Explanation: Stainless steels are hardened by constant heating and cooling and the best method suited for this alloy is electric butt welding. As soon as the stainless steel alloy is electric butt welded, it needs to be annealed at a temperature in between 750°C to 800°C.
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Generally, the two most commonly selected materials for heat exchanger are aluminium and copper. Both metals have the optimum thermal properties and corrosion resistance to make them ideal choices, with most of the differences being application-specific.
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Ans: Coils of electric toasters and electric irons made of an alloy rather than a pure metal because the resistivity of an alloy is higher than the pure metal. Also at high temperatures, the alloys do not melt easily.
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Heating in an electrical circuit is always caused by current flowing through a resistance. If there is significant resistance in the contact between fuse and fuse holder, a current well below the fuse rating can cause enough heat to melt an inline fuse holder.
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Metals are particularly good conductors of heat because their particles are very closely packed so the vibrations are passed on very quickly. ... This makes them move faster and they travel through the metal, colliding with both atoms and other electrons.