An electric bulb glows when electric current passes through it.
Understand the Problem
The question is stating a fact about how an electric bulb operates, specifically that it illuminates when electric current flows through it. This indicates a basic understanding of the principles of electricity and how light bulbs function.
Answer
The bulb glows because the filament's high resistance leads to heating by electric current, emitting light.
An electric bulb glows due to the heating effect of electric current. When current passes through its filament, the filament's high resistance causes it to heat up, becoming white hot and emitting light.
Answer for screen readers
An electric bulb glows due to the heating effect of electric current. When current passes through its filament, the filament's high resistance causes it to heat up, becoming white hot and emitting light.
More Information
The filament in a bulb is typically made from tungsten, which is chosen for its high melting point and ability to glow brightly when heated.
Tips
A common mistake is not considering the role of resistance. It's actually the resistance in the filament that causes it to heat up and emit light.
Sources
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