Supplementary knowledge:
△ Conductors and insulators:
a. Conductors: Some objects are good at conducting electricity called conductors (Conductor). For example: metal, the human body, earth, graphite, acid, alkali, salt water solution are conductors.
b. Insulator: some objects are not good at conducting electricity called insulator (Insulator), for example: rubber, glass, plastic, ceramics, oil, pure water, dry paper, dry sticks, dry air, etc. are insulators.
c. Conducting and insulating explanation: conductor conducts electricity: conductors have the ability to move freely in the charge (+, -) (metal conducts electricity is due to the presence of a large number of free electrons in the metal (-)); insulator insulating reason: charge is almost always bound in the range of atoms, can not move freely.
d. There is no clear boundary between a conductor and an insulator; an insulator can become a conductor and a conductor can become an insulator when conditions change. For example, heating causes some electrons in an insulator to break free of atoms and become freely charged, at which point the insulator becomes a conductor.
I hope this helps, if you have any questions, you can follow up~~~
Good luck with your studies! (*^_^*)
Edited on 2012-08-18
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