Advertisements
Advertisements
Question
Why are metals good conductors of electricity whereas glass is a bad conductor of electricity? Give reason?
Advertisements
Solution
For a material to be a conductor, it has to have a reasonable number of free electrons (i.e. electrons that are loosely bound to there atoms).The more the number of free electrons available, the better it is as a conductor.Glass, for all practical purposes, has no free electrons in its crystalline structure, therefore, is an insulator. Whereas, metals have large number of free electrons in room temperature. Thus, metals are good conductors of electricity.
APPEARS IN
RELATED QUESTIONS
Give three reasons why different electrical appliances in a domestic circuit are connected in parallel.
In which of the following cases more electrical energy is consumed per hour?
(i) A current of 1 ampere passed through a resistance of 300 ohms.
(ii) A current of 2 amperes passed through a resistance of 100 ohms.
Tick (✓) the correct choice among the following :
Which of the following changes would enable a millimeter to be used as a
direct current ammeter reading upto 1 A?
A bulb of 40 W is used for 12.5 h each day for 30 days. Calculate the electrical energy consumed.
My mother was operating washing machine on Sunday morning. Suddenly, she saw a spark coming out of the electric board and the electric current in the house failed. An electrician was called to look into the matter. What should he have noticed.
What determines the direction of flow of electrons between two charged conductors kept in contact?
An ammeter is always placed in parallel with the circuit.
