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What does an electronic resistor do?
A resistor is a passive two-terminal electrical component that implements electrical resistance as a circuit element. 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.
How are resistors classified?
All modern fixed value resistors can be classified into four broad groups: Carbon Composition Resistor – Made of carbon dust or graphite paste, low wattage values. Film or Cermet Resistor – Made from conductive metal oxide paste, very low wattage values.
Does a variable resistor have have a fixed resistance?
The variable resistors are the one which offers variable value of resistance. Thus, it is also known as an adjustable resistor. Variable resistor has three leads, in which two leads are fixed, and one is movable. Thus, through with this movable lead the value of the resistance varies.
How can a variable resistor be used?
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. Resistors are common elements of electrical networks and electronic circuits and are ubiquitous in electronic equipment.
What is a variable resistor called?
A variable resistor, also called an adjustable resistor, consists of two terminals, where one of the terminals is a sliding or moving contact often known as a wiper. This is an IEC international symbol of such a device.
What is the use of variable resistor in circuit?
Variable Resistors | Definition, Uses & Types Variable Resistor Connection. It is used as a rheostat when one end of the resistance track and wiper terminal are connected to the circuit and other terminal of resistance track Types of Variable Resistor. Uses of Variable Resistors. Preset Variable Resistor.