what would happen if electric wires are covered with metals?
Answers
If you look at it an electrical wire is a bit like a hose that is used to conduct water to a point we wish to use it. Like a sprinkler. Without the hose the water just goes where we do not want it to go and not to the sprinkler.
Copper and Aluminium are good conductors of electricity. They are relatively cheap and an abundant recourse unlike silver and gold which are better conductors of electricity but much more expensive. So that is why we use them mostly as electrical conductors.
OK so we need to contain the electricity inside the wire so it goes to where we want it to go to do the work we want it to do.. Other wise it will divert to whatever conductive path it can find and we loose it or we can be harmed by it. Electricity has the i=unfortunate habit of trying to escape. If it can find an alternate path back to the other terminal of the supply it will. The results can be disastrous. since we make many electrical appliances out of metal like steel which is a conductor we need to contain the electricity in the wires so it does not leak into the metal surrounds. That would give us a shock. Not a nice thing to happen.
So we use a material called an insulator to keep the electricity inside the cable. Rubber and plastic (PVC) are the most common by other materials are also used like glass, fibreglass, ceramics as well as many other materials. The type of insulation is determined by temperature and the type of environment the cable is used in.
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