How does an incandescent light bulb work?
The wire inside a light bulb is called a filament. It is made of tungsten, a metal that stays solid at very high temperatures. Electricity flows through the tungsten filament, causing it to heat up and glow. The glow gives off light. Inside a light bulb is a vacuum – in other words, all the air has been removed from inside the glass bulb. (If there were air inside, the wire would burn up.
The wire inside a light bulb is called a filament. It is made of tungsten, a metal that stays solid at very high temperatures. Electricity flows through the tungsten filament, causing it to heat up and glow. The glow gives off light. Inside a light bulb is a vacuum – in other words, all the air has been removed from inside the glass bulb.
