Question

Explain how materials are classified on the basis of electrical conductivity. Give two uses of these materials in day to day life.

Answer 1

Explanation:

CLASSIFICATION OF MATERIALS ON THE BASIS OF CONDUCTIVITY

On the basis of conductivity ,the materials can be classified in to following categories:-

(a) Conductors:- These are those materials whose electrical conductivity is very high. Conductors conduct charges very easily . For super-conductor , the value of electrical conductivity is infinite.

Examples. Copper,Silver.Aluminum,Tungsten etc.

(b) Semiconductors:- They are those materials whose electrical conductivity lies in between insulators and conductors . Semiconductors can conduct charges but not so easily as in case of conductivity.

Examples. Germanium.Silicon etc.

(c) Insulators:- These are those materials whose electrical conductivity is either very very small or nil. Insulators do not conduct charges.

Examples. Glass,Rubber,Wood etc.

ELECTRIC CURRENT

Definition. Electric current is defined as the rate of flow of electric charge q, that is

I=q/t

The unit of current is ampere ,A

If the current is not varying with time , then the current is called steady electric or stationary current.

In the conductors ,current is due to motion of electrons .In gases , the charge is carried by electrons and positive ions.In Liquids, the charge is carried by positive and negative ions. In semiconductors ,the movement in charge is due to electrons and holes.

Answer 2

Explanation:

On the basis of electrical conductivity, materials are classified as conductors, semi-conductors and non-conductors.

Conductors : Substances through which electricity can easily pass through are known as conductors. For example, copper, silver, mercury etc are good conductors of electricity.

Copper utensils are used for cooking.

Mercury is present in thermometers and it is used to determine body temperature.

Semi-conductors : Substances through which electricity can partially pass through is known as a semi-conductor. For example, germanium, silicon etc are semi-conductors.

Generally, semi-conductors are used in the electronic devices.

Non-conductors : Substance that do not allow electricity to pass through them are known as non-conductors. For example, glass, wood are non-conductors.

Wood is used to make tables, desks etc.

Glass is used to make crockery.

Learn more about electrical conductivity:

https://brainly.in/question/14700711

https://brainly.in/question/5556711

#Learnwithbrainly