Question 22:
Why are alloys preferred for the heating elements in devices like toasters?
Options :
- a) They are good electrical conductors with low resistivity
- b) They have higher resistivity and do not oxidise readily at high temperatures
- c) They have a low melting point
- d) They are insulators
correct answer : b)
Explanation :
Alloys such as Nichrome have higher electrical resistivity than pure metals and do not easily oxidize (burn) even at glowing red-hot temperatures, making them ideal for heating coils in toasters, geysers, and irons.