Q14 of 330 Page 18

Classify the following into good conductors, resistors and insulators:

Rubber, Mercury, Nichrome, Polythene, Aluminium, Wood, Manganin, Bakelite, Iron, Paper, Thermocol, Metal coin

Those substances which have very low electrical resistance are called as good conductors like mercury, aluminum, iron, metal coin.

Those substances which have comparatively high resistance than conductors are known as resistors. The alloys like nichrome, manganin.


Those substances which have infinitely high electrical resistance are called insulators like rubber, polythene, wood, bakelite, paper, thermocol


More from this chapter

All 330 →
12

Fill in the following blank with a suitable word :

Ohm's law states a relation between potential difference and ........................

 13

Distinguish between good conductors, resistors and insulators. Name two good conductors, two resistors and two insulators.

 15

What is Ohm's law? Explain how it is used to define the unit of resistance.

 16

What is meant by the "resistance of a conductor"? Write the relation between resistance, potential difference and current.