A resistor restricts
current flow in an electrical circuit without switching the current off. A
variable resistor allows more control over current flow by changing the amount
of resistance. When resistance increases in a variable resistor, the amount of
current that is allowed to flow in a circuit decreases.
https://www.futureelectronics.com/p/passives--resistors--variable-resistors/67wr50klf-tt-electronics-bi-technologies-3570744
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