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Potentiometers, rheostats and trimmers are three-terminal resistors that are used to measure or divide voltages, and to protect or control circuits. Potentiometers are variable resistors that are adjusted with a knob or dial. Rheostats and trimmers are types of potentiometers. With a rheostat, a third “wiper” terminal is shorted to one of two fixed terminals. The wiper terminal has a resistance which varies with its position, and the two fixed terminals are connected by a fixed resistance. Trimmers are factory-set devices that require infrequent adjustments. They feature a slotted, actuator-type style and can be adjusted with a special tool or screwdriver. Other types of potentiometers, rheostats and trimmers are also available. These include standard potentiometers, mechanical devices in which the output resistance is set by a shaft; and digital potentiometers, which set an output resistance by sending a digital signal through an electrical interface.  

Potentiometers, rheostats and trimmers carry specifications for potentiometer category and actuator configuration. Industrial-grade potentiometers are protected by an enclosure, typically one that is rated by the National Electrical Manufacturers Association (NEMA). Typically, industrial-grade products are gear-driven and have connector outputs. These potentiometers, rheostats and trimmers resist the ingress of dirt and dust, and last longer than unenclosed potentiometers. Discrete-board components, another potentiometer category, are also commonly available. In terms of actuator configuration, choices include single-turn, multi-turn, and slide. With single-turn devices, the shaft rotation is limited to less than or equal to 360 degrees. By contrast, multi-turn potentiometers, rheostats and trimmers can be rotated multiple times, with as many as 15 or 20 turns from stop to stop. Slide-actuated products require the user to move a handle instead of rotating a knob.  

Engineering Calculators Related to Potentiometers, Rheostats and Trimmers
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Products & Services Related to Potentiometers, Rheostats and Trimmers
Chip Resistors
Chip resistors are passive resistors with a form factor of an integrated circuit (IC) chip. Typically, they are manufactured using thin-film technology.
Digital Potentiometers
Digital potentiometers are three-terminal resistors with an adjustable center connection. To set the output resistance, a digital signal is sent through an electrical interface.
Power Resistors
Power resistors are used in power generation and distribution, high-voltage applications, control systems, and other power system applications. They include load banks, grounding resistors, and dynamic braking resistors.
Resistor, Capacitor Networks
Resistor, capacitor networks (RC networks) are integrated circuits (ICs) that contain resistor-capacitor arrays in a single chip.
Resistors
Resistors are electrical components that oppose the flow of either direct or alternating current. They are used to protect, operate, or control circuits.
Resistors and Potentiometers
Resistors and potentiometers are passive electronic components that oppose the flow of either alternating current (AC) or direct current (DC). 
Shunt Resistors
Shunts resistors are connected in parallel with an instrument or component to divert electrical current. They provide an alternate path for current in case of failure.

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Engineering Web: Potentiometers, Rheostats and Trimmers
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... Potentiometers, Trimmers, Controls, and Rheostats  ... ...
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Variable resistors - Potentiometers, rheostats and trimmers - Definitions, selection parameters, and applications CAPACITORS *Definitions - Applications and selection parameters *Types - Variable, non-polarized ...
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Potentiometers on process-controls.com
Potentiometers are variable resistors, typically adjusted via a knob or dial. Rheostats and trimmers are types of potentiometers.. A. A-KAST MEASUREMENTS & CONTROL LTD. A-TECH INSTRUMENTS LTD. ...
Potentiometers on process-controls.com
Potentiometers are variable resistors, typically adjusted via a knob or dial. Rheostats and trimmers are types of potentiometers.. A. A-KAST MEASUREMENTS & CONTROL LTD. A-TECH INSTRUMENTS LTD. ...
See Process Controls and Instrumentation Information
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... Electronic, Potentiometers, Controls. *Marketplace, Manufacturing, Electronics, Components, Electronic, Potentiometers, Rheostats. *More related categories!. Search for Potentiometers, Trimmers on: ...

Part Numbers for Potentiometers, Rheostats and Trimmers

Part # Distributor Manufacturer Product Category Description
RLS75RE Newark OHMITE Rheostat Rheostat; Series:RLS; Power Rating:150W; Resistance Max:75Ohm; Terminal Type:Lugs; Leaded Process Compatible:Yes; Peak Reflow Compatible (260 C):Yes; Resistance:75Ohm RoHS Compliant: Yes
RLS100 Newark OHMITE Rheostat Rheostat; Series:RLS; Power Rating:150W; Resistance Max:100Ohm; Terminal Type:Lugs; Leaded Process Compatible:No; Peak Reflow Compatible (260 C):No; Number of Turns:1; Resistance:100Ohm RoHS Compliant: No
MP15A2500 Newark VISHAY ANGSTROHM Rheostat Rheostat; Series:MP; Power Rating:50W; Resistance Max:2.5kOhm; Terminal Type:Lugs; Resistance:2.5kOhm; Type:Rheostat
548 Newark Not Provided Rheostat Legend Plate
RRS40RE Newark OHMITE Rheostat Rheostat; Leaded Process Compatible:Yes; Peak Reflow Compatible (260 C):Yes; Resistance:40Ohm RoHS Compliant: Yes

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