Electrical Engineering ⇒ Topic : Conductors, Insulators, Semiconductors, and Superconductors
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Leo
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CONDUCTORS:-Conductors are substances that permit free motion of a large number of electrons. Copper wire is a good conductor of electricity because it has many free electrons. Electrical energy is transported through conductors by the movement of free electrons inside the conductor. The greater the number of electrons that move in a material, the better are its conducting properties. A good conductor will have a large number of free electrons and will offer a very low resistance to the current (electron) flow. Some good conductors of electricity which are in use are copper, aluminium, etc. INSULATORS:-Some substances like rubber, glass and wood are not good conductors of electricity. In these materials, large amount of energy is required to be spent to make the electrons come out of the atom. Such substances which have very few free electrons are called insulators. Good conductors are used as wires to carry current and good insulators are used to prevent current from flowing into unwanted areas. | |
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