1 Answer | Add Yours
A bulb glows when an electric charge flows through the filament in the bulb. The flow of current I creates heat in the filament that is equal to I^2*R*t where R is the resistance of the filament and t is the duration of the flow of current through the filament.
A part of the heat generated is electromagnetic radiation with a wavelength that lies in the range of visible light. This is the visible light emitted by a bulb. It is not possible to make a bulb glow by the use of static electricity. The charges have to move through the filament.
If two oppositely charged bodies are connected to either end of a bulb a current flows through the filament on its own. This is the principle behind the operation of flash lights where a bulb is connected across the oppositely charged plates of a capacitor.
We’ve answered 287,407 questions. We can answer yours, too.Ask a question