Like what about plastic makes it impossible for electricity to flow through it as opposed to something like metal?
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All materials conduct electricity (which is just electrons flowing from one atom to the next). Some atoms just hold onto their electrons more firmly, which means it takes more energy to get them moving and generates more heat from resistance as they do move. Air is a terrible conductor, yet lightning happens when the entire might of a storm pushes electrons along, but you could make electrons move through the same distance of wire with just a small battery.
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