Multiple choice

The filament of an electric bulb is made of

  1. copper

  2. soft iron

  3. cast iron

  4. tungsten

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

Tungsten is used for lamp filaments because it has the highest melting point of all metals (3422 degrees Celsius). This allows it to glow white-hot without melting when an electric current passes through it.