If you require adjustable power resistors for your various operations, the experts at ASAP Parts Online have everything you need at unbeatable prices. Owned and operated by ASAP Semiconductor, we provide customers access to a massive inventory containing over 2 billion new, used, obsolete, and hard-to-find items that have been sourced from thousands of global manufacturers that we trust. Take the time to explore our offered adjustable power resistors that are ready for purchase on our website, and our team members are always on standby to assist you with competitive quotes for your comparisons.
Adjustable power resistors, otherwise known as variable resistors, are common types of resistor components that may have their electric resistance value adjusted. Generally, such components are a type of electromechanical transducer, taking advantage of a wiper or contact that moves across the resistive element. Often featuring upwards of three terminals, variations that use all three terminals are known as a potentiometer while those that use two are called rheostats. Generally, potentiometers act as a potential divider while a rheostat operates with variable resistance. If such devices are controlled by electronic means, rather than through manual adjustments, they are known as digital potentiometers.
Potentiometers are the most widely used variable resistor, capable of producing a voltage signal that varies based on the potentiometer’s positioning. Generally, potentiometers are used for applications related to amplifier gain control, distance or angle measurement, the tuning of circuitry, and more. Trimmer potentiometers, or trimpots, are special variable resistors that are used for the tuning or calibration of a circuit.
Rheostats, on the other hand, are quite similar to potentiometers, though only operate with two terminals. One connection is established near the end of the resistive element, while the other is established at the wiper. Historically, rheostats found use as power control devices in series with the load, though have since been replaced with more efficient components. For tuning or calibrating circuits, preset variable resistors are best.
Digital adjustable power resistors can allow for changes in resistance to be performed with electronic signals, rather than with mechanical movement. With the use of digital protocols or up and down signals, the overall resistance provided by the resistor may be adjusted in steps. Generally, digital potentiometers or variable resistors may be employed anywhere where conventional resistors may be employed.
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