Give reasons for the following :why are copper and aluminium metals used as connecting wires? Why is tungsten used for filament of electric lamps? Why is lead -tin alloy used for fuse wires?
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♦ Copper and Aluminium metal are used for making connecting wires . Copper and Aluminium has high melting point and can be drawn into wires that is it is ductile. Because of high melting point , copper and aluminium won't melt when heat is produced according to Joule's law of heating [ H = I²Rt ] . If wire melts , there is chances of short circuits.
♠ Tungsten is used as filament in bulbs and lamps because it has a high melting point of 3380° C which won't melt easily. The filament must be eaten as much of heat generated as is possible, so that it gets very hot and emits light. It does not melt at such a high temperature.
♣ Lead - Tin alloy is used for fuse wires . Fuse wire should have appropriate melting point . It protects the appliances when larger current flows through the fuse which is more than its rating. When larger current flows according to Joule's law of heating , H = I²Rt larger heat is produced and wire will melt to break the circuit. So actually fuse wire should have a low melting point. So alloys are used for making fuse wire of appropriate melting point.
Hope it helps
♦ Copper and Aluminium metal are used for making connecting wires . Copper and Aluminium has high melting point and can be drawn into wires that is it is ductile. Because of high melting point , copper and aluminium won't melt when heat is produced according to Joule's law of heating [ H = I²Rt ] . If wire melts , there is chances of short circuits.
♠ Tungsten is used as filament in bulbs and lamps because it has a high melting point of 3380° C which won't melt easily. The filament must be eaten as much of heat generated as is possible, so that it gets very hot and emits light. It does not melt at such a high temperature.
♣ Lead - Tin alloy is used for fuse wires . Fuse wire should have appropriate melting point . It protects the appliances when larger current flows through the fuse which is more than its rating. When larger current flows according to Joule's law of heating , H = I²Rt larger heat is produced and wire will melt to break the circuit. So actually fuse wire should have a low melting point. So alloys are used for making fuse wire of appropriate melting point.
Hope it helps
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