Question

why electric wires are insulated

Answer 1

The main purpose of the "cover" (insulation) is to keep the wire from shorting to other objects.

The plastics used generally have a good mix of the following properties:

It is flexible so the wire can be flexed and bent.

It is inexpensive and easy to apply to the wire during manufacturing.

Answer 2

Dielectric is what it is often referred to in radio frequency cables. Cable andwire insulation prevents the insulated wire's current from coming into contact with other conductors. It preserves the wire material against environmental threats and resistselectrical leakage.