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What is the difference between a resistor and an insulator?

Resistors and insulators both oppose the flow of electricity through themselves. They differ only in the degree to which they oppose the flow of electric current.

resistor               composite insulator

        resistor                                                                              composite insulator

Resistors are usually divided into carbon film resistors, metal film resistors and wire-wound resistors and so on according to the materials.

Insulators are usually divided into ceramic insulator, glass insulator and polymer insulator and so on according to the materials.

The difference between a resistor and an insulator
Its kind like saying that what's the difference between a faucet which has been almost shut off (that's like the resistor) and a faucet that has been entirely shut off (that's like the insulator).

Both a resistor and a faucet that has been shut off almost all the way will not let much flow pass through them, but they do allow a little to pass. Likewise, both an insulator and a faucet that has been completely shut off will block all flow through them. Resistors resist, but insulators insulate. Resistors are like a bumpy, curvy road, but insulators are like a washed-out bridge...no traffic.

The reason for the difference between resistors and insulators
The reason for the difference between resistors and insulators lies in the fact that resistors are made of materials that pull rather strongly on their outer (valence) electrons, whereas as insulators pull very strongly on their outer (valence) electrons.

So, while it's kinda hard to get electrons to flow through a resistor, it can be done, but it is next to impossible to get electrons to flow through an insulator, under ordinary circumstances. Conductors, on the other hand, are like faucets that have been opened up all the way, or like interstate freeways, where the current flows freely and easily. These materials, such as metals, exert very little pull on their outer/valence electrons, so it takes very little voltage to cause a current flow through them.

The difference between a resistor and an insulator has
◆ A resistor is usually used in circuit
◆ An electrical insulator, such as composite suspension insulator is usually used on overhead lines.

 

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