Multiple choice

The filament of an electric bulb is made of

  1. iron

  2. nichrome

  3. tungsten

  4. graphite

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Tungsten is used for electric bulb filaments because it has an extremely high melting point (3422°C) and low vapor pressure at high temperatures. This allows it to withstand the intense heat of incandescence without rapidly evaporating or breaking.