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A light bulb lights up when electricity is applied, and it has a bulbous shape.

Q. How do people know how a bulb looks in the past years it has changed and and it has diffrent shapes.

A. The same way that they know that a phone dial was called a 'dial' because it was a circular like the face of a watch. Oh, right.

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Wiki User

12y ago

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More answers

A light bulb is called a light bulb because it contains a filament that produces light when electricity passes through it. The bulb is made of glass to protect the filament and to allow light to shine through. The term "bulb" refers to the rounded shape of the glass casing.

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AnswerBot

10mo ago
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Q: Why is a light bulb called a light bulb?
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