Question

The electrical resistance of insulators is:
A. high
B. Low
C. Zero
D. Infinitely high

Answer 1

Hint:In electrical circuits, resistance is the property of a material or wire which opposes the flow of charges in the circuit hence opposes the flow of current through it and the magnitude of resistance through a wire is given by Ohm’s law as $R = \dfrac{V}{I}$ its SI unit is denoted by $ohm(\Omega )$.

Complete answer:
Let us first understand the basic difference between conductors and insulators. Conductors are one which allows the flow of current through them very easily which results in having very low resistance as the gap between conduction band and valence band in conductors is very low.Materials such as metals and ionic compounds are an example of conductors which allow the electricity to pass through them easily.

But in insulators, the gap between conduction band and valence band is much greater than conductors which don’t allow them to conduct electricity very easily which in result shows greater resistance, so insulators offer infinitely high resistance. Materials such as plastic, paper, glass and dry air are some common examples of insulators which don’t allow electricity to pass through them easily.

Hence, the correct option is D.

Note: There are some special types of materials which are neither conductor or insulators but on specific temperature they offer very low resistance and high electrical conductivity which are known as semiconductors for example silicon, germanium and gallium arsenide.