why heating element made of alloy rather than metals
sagar10031:
because alloy is do not burn easily at high temperature and alloy has High resistivity
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it has relatively high resistance and form an adherent layer of chromium oxide when it is heated for the first time
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Alloys generally have higher resistance than the pure metals that they are made of, because the alloy disorder of the atoms causes additional electron scattering.
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To get the correct resistivity. If resistivity is low, more wire would be needed to get a desirable power rating (hence heat producing ability)The resistivity of alloys is always more than its constituent metals. They have high melting points and do not burn easily.
To get the right metallurgical properties: malleability (low brittleness) and ductility - suitable for making thickish wires which don’t break when wound into a coil
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