Is plastic a good conductor of electricity?

Plastics are bad conductors of electricity and heat. Generally speaking, good conductors have excess of free 'de-localized' electrons which move from the area of higher potential to lower potential i.e. Negative to positive.

This movement is what constitutes conduction of electricity. Since plastic does not have these de-localized electrons, they cannnot conduct electricity On the other hand, during conduction of heat, what happens is that higher energy atoms vibrate vigorously in their own positions. This leads them to bump into other atoms of lower kinetic energy and vibrational energy.

Once in contact, the higher energy atoms transfer their energy to the lower energy atoms. This eventually leads the cooler end of the material to become hot i.e. Eventually the heat get transferrred from the hotter end to the cooler end, till there is uniform distribution of heat.

Having said all this, plastic in some cases, might be a very weak conductor of heat i.e. The cooler end of the plastic container will heat up a little bit if you put hot water or heat one end. This will happen till plastic reaches its melting point So, in summary, plastics are bad conductors of electricity and weak conductors of heat.

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