Multiple choice

The heating element is made of

  1. iron

  2. silver

  3. zinc

  4. chromium
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Heating elements are made of chromium (in the form of nichrome alloy with nickel). Chromium has high electrical resistance and high melting point, making it ideal for converting electrical energy to heat without degrading. Iron would rust, silver is too expensive and has low resistance, and zinc has too low a melting point.

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