Physics for IGCSE & O level - Electricity (Section 12 - No. 39)
What is the purpose of the filament in a light bulb?
To conduct electricity efficiently.
To emit light when heated by the electric current.
To store electrical energy.
To regulate the voltage.
Giải thích
The filament is the part of the light bulb that heats up and emits light when electricity passes through it.