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A resistor is a metal or compound that does not conduct electricity very well. It is used to reduce the amount of current going through a circuit and converts some of the current into heat. In its simplest form a variable resistor uses the same metals and compounds but spreads them out in a line or arc and uses a metal contact to slide or rotate over the material. One contact is on the metal moving contact and the other contact is at one end of the resistor. Moving the contact changes the distance the current must move through the resistor thus changing the amount of current reduced.

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Q: What is the difference between a resistors and variable resistors?
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