a) Why is the tungsten used almost exclusively for filament of electric lamps?
b) Why are the conductors of electric heating devices, such as bread-toasters and electric irons, made of an alloy rather than a pure metal?
c) Why is the series arrangement not used for domestic circuits?
d) How does the resistance of a wire vary with its area of cross-section?
e) Why are copper and aluminium wires usually employed for electricity transmission?