Question

The same current flows through the electric line wires and the filament of bulb yet only filament and glows, why?

Answer 1

The filament of an electric bulb is made up of material like tungsten which has high electric resistance.So whe the current passes through thid filaments it heats up and glows.
Where as the wires are the good conductros of electricity which cannot stop electricity so they cannot heat up if the circuit is proper.