Q.No.210: - Why electric current pass through conductors?

Q.No.210: - Why electric current pass through conductors?

Ans: - Because conductors have electrons that are loosely packed with nucleus and become a free electron after getting a small energy. These free electrons conduct electricity.

Q.No.181: - Name two factors which can enhance thermionic emission.

Q.No.181: - Name two factors which can enhance thermionic emission.

Ans: - 1) Temperature

 2) Sun light and heat is used to generate electricity and increase the efficiency of solar power production by more than twice the current levels.

Q.No.142: - Why in conductors charge is transferred by free electrons rather than by positive charges?

Q.No.142: - Why in conductors charge is transferred by free electrons rather than by positive charges?

Ans: - Because electrons are free in conductor and they are in majority. When we apply an external electric field with the help of a battery (source of emf) then these free electrons move from negative to positive terminal of battery. On the other side, positive charges are present in the nucleus of the atom and they are not free to move that’s why electric current is caused by free electrons.

Q.No.137: - How fluorescent lamp works?

Q.No.137: - How fluorescent lamp works?

Ans: - In the case of fluorescent lamp an electric current passed through the gas in the tube causes the electrons to move to higher energy states. When the electrons return to their original energy states, they give up their excess energy in the form of ultraviolet radiation. This radiation is absorbed by atoms of the coating on the inside of the glass tube, which then emit visible light.