Glass, paper, Teflon and rubber are good insulators of electricity. An insulator is a substance that allows very little electric current to flow through it. There is no perfect insulator, but materials that offer a high degree of resistance to the flow of electrons are good insulators.Know More
All substances offer resistance to the flow of electric current through them. This is called the resistivity of the material. Different materials have varying resistivity levels. The higher the resistivity of the material, the less electric current passes through it.
Rubber has high resistivity of 1-100 x 1013ohm-meter, making it a good insulator. Copper has a low resistivity of 1.59 x 10-8 ohm-meter, which makes copper a good conductor of electricity, or a poor insulator.Learn more in Electricity
Glass is a good electrical insulator because the electrons in the glass are tightly bound to the atoms and do not transfer easily, thus keeping electricity from moving through the glass. Conversely, good electrical conductors contain electrons that move freely.Full Answer >
Metals are good conductors of electricity, because they have free electrons. These free electrons act as charge carriers in the metallic structure, allowing electric current to flow through the metal.Full Answer >
Gold is a very good conductor of electricity. It is often used as plating for connectors because it does not tarnish or corrode easily.Full Answer >
Copper is a good conductor of electricity because the valence electrons are free and repel each other so strongly that it causes the repulsion of other electrons. This essentially forces the electricity down the piece of copper, or conducts it down the metal.Full Answer >