Variable Resistors Wikipedia

If only two terminals are used one end and the wiper it acts as a variable resistor or rheostat. Rheostats are for anything above 12 watt.

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The jfet and the mosfet.

Variable resistors wikipedia. The name varistor is a portmanteau of varying resistor. These are also called potentiometers or rheostats and allow the resistance of the device to be altered by hand. The term is only used for non ohmic varying resistors.

Two types of fets are often used. Resistors are common elements of electrical networks and electronic circuits and are ubiquitous in electronic equipment. Trimmers can be variable resistors potentiometers variable capacitors or trimmable inductors.

A voltage controlled resistor vcr is a three terminal active device with one input port and two output ports. Variable resistors can be used to adjust circuit elements such as a volume control or a lamp dimmer or as sensing devices for heat light humidity force or chemical activity. The measuring instrument called a potentiometer is essentially a voltage divider used for measuring electric potential voltage.

There are both floating voltage controlled resistors and grounded floating. The input port voltage controls the value of the resistor between the output ports. Trimpots are often used to initially calibrate equipment after manufacturing.

Vcrs are most often built with field effect transistors fets. Variable resistors such as the potentiometer and the rheostat have ohmic characteristics. The variable resistor is a resistor whose value can be adjusted by turning a shaft or sliding a control.

The component is an implementation of the same principle hence its name. They are common in precision circuitry like av components and may need to be adjusted when the equipment is serviced.