1.

A few heating appliances are shown in the Examine any one of them and answer the following questions. Record the answers in the science diary.1. Name the part in which electrical energy changes into heat energy.2. Which material is used to make this part?3. What are the peculiarities of such substances?

Answer»

1. Heatingcoil

2. Nichrome: 

Heating coils are made of nichrome. It is an alloy of nickel, chromium and iron.

3.

  • High resistivity
  • High melting points
  • Ability to remain in red hot condition for a long time without getting oxidized. 
  • Thermal expansion is negligible.


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