Presets are just like. The electrical resistance is varied by sliding a wiper contact along a resistance track. Potentiometer Variable Resistor 500k Ohm Variable Resistor Images Stock Photos Vectors Shutterstock 20k Ohm Variable Resistor Trimpot Pot3106z 1 203 In electronic circuits resistors are used to reduce current flow adjust signal levels to divide voltages bias active elements and terminate transmission lines among other uses. Electronic variable resistor . Rheostats are a two terminal device and may use either a sliding or a rotating wiper to control the resistance. Mostly they are used as a three terminal device. It is an electronic component. The type of variable resistor that may be termed adjustable are those that have a spindle and can be used with a knob. Definition of variable resistor. It is applied in an electronic circuit for...