Keeps the current in the conductor. Without the insulation on a conductor the current can and will leave the intended path in the electrical circuit if it comes in contact with some other conductive path if there is a difference of potential.
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Wood is an insulator.
yes, its an insulator. its a type of insulator used for wires, cables, etc
is foam dirt an metal a good insulator
Diode is a semiconductor material. so it act as insulator also.
A candle in not in the electrical classification category as being used for an insulator.