Question

why is copper wire not used in the filament of a bulb or as a heating element of heater?what will happend if we use a thick tungsten wire in a electric bulb?

Answer 1

Copper wire is not used in filament of bulb or as a heating element of heater because:-
1. Its melting point is lower than tungsten and at high temperature the copper will melt.
2. Resistivity of tungsten is higher than copper.

If we use a thick tungsten wire in the electric bulb , then the resistance will get reduced and to achieve the requisite heat, more energy will be spent.