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A resistor is a passive two-terminal electrical component used in circuits to create electrical resistance. Resistors have a variety of purposes in electronic circuits, including lowering current flow, adjusting signal levels, dividing voltages, biasing active components, and terminating transmission lines. High-power resistors that can generate many watts of heat instead of electrical energy can be utilized as test loads for generation units, power distribution systems, and motor controls. With temperature, time, or operating voltage changes, fixed resistors’ resistances only slightly fluctuate.