Question

Though same current flows the wire and the filament of a bulb, yet only the filament glows.Why?

Answer 1

The resistance of electric line wires is very, very less than that of the filament of the bulb and as the wires are the good conductors of electricity which cannot stop electricity so they cannot heat up if the circuit is proper. Therefore, the current through high resistance filament produces more heat which makes it glow.