Question

When current is passed through an electric bulb, its filament glows, but the wire leading current to the bulb does not glow because :

• A. Less current flows in the leading wire as compared to that in the filament
• B. The leading wire has more resistance than the filament
• C. The leading wire has less resistance than the filament
• D. Filament has coating of fluorescent material over it

Answer 1

The correct option is C The leading wire has less resistance than the filament

The leading wire is usually made with conductors such as copper and aluminium, therefore have less resistance than the filament which is usually made with tungsten and has a high resistance.
Due to this the power lost P $=I^{2}R$ is greater for filament which is visible as light(and also heat).