Multiple choice

Heating elements of devices like electric heater and geyser are made of alloys because alloys have __________.

  1. quality of ductility and malleability

  2. high resistance and high melting point

  3. low resistance and low melting point

  4. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Alloys are used because they have high melting point which ensures that the heating element does not melt upon heating continuously. The element chosen as heating element should be such that it has high resistance because of Joule's law of heating: Heat is directly proportional to resistance, i.e. more resistance more heat.

Keep practicing — related questions