Explain the following.
a. What makes tungsten the preferred material for electric lamp filaments?
Tungsten is commonly used as a filament in electric bulbs because of its properties. Those are
(i) It has .
(ii) It has a .
(iii) It is not easily .
b. What makes alloys more suitable than pure metals for use in electric heating appliances?
The conductors of electric heating devices are made of alloys rather than a pure metal because it has , and are not easily .
and is preferred as a heating element in electrical appliances such as bread-toasters and electric irons.