3)Puretungstenhas some amazing properties including the highest melting point (3695 K), lowest vapor pressure, and greatest tensile strength out of all the metals.Because of these properties it is the most commonlyusedmaterial for lightbulb filaments.

1)Copperis a very good electrical conductor. This means that the resistance of a length ofcopper cableis relatively low. Analuminium cablewould have nearly twice the resistance of acopper cablewith the same dimensions. Therefore the energy losses in thealuminium cablewill be higher than in thecopper cable.

2)Fuse wires are made of Tin-lead alloy instead of copper due to various reasons.This wire is consist of low melting point as well as the have the high resistance.The alloy result in good functioning of the fuse. As the tin cause the good conductivity property . Also the low melting point occur due to the lead.Other wise the fuse can cause problem due to the surface corrosion.Hope this helps.

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Thanks mt bola