Table of contents 

  • what is resistor
  • unit of resistor
  • symbol of resistor 
  • how does a resistor work 
  • types of resistor 

What is a resistor?

A resistor is an electrical component that limits or regulates the flow of electrical current in an electronic circuit. Resistors can also be used to provide a specific voltage for an active device such as a transistor.

Resistor is a passive two terminals electrical component used for limiting or regulating the flow of electricity in a circuit.

What is the SI unit of resistor?

The SI unit of resistance is known as Ohm Ω. Kilooh
ms KΩ, megaohms MΩ, milliohm, and so on are known as the higher multiple and sub-multiple values of Ohm.


symbol of resistor

                                                  

How does a Resistor Work?

Any material (except superconductors) will resist the flow of current. If it is a conductor, the resistance to the flow of current is less and vice versa for an insulator. A Resistor works by using this natural property of resistivity/conductivity of any material. It absorbs energy from the flow of electrons (electric energy) and dissipates in the form of heat (thermal energy).


Types of Resistors



Resistors are available in different shapes and sizes. Common types that are available are through-hole and surface mount. A resistor might be static, standard resistor, special, or a pack of variable resistors.


There are two basic types of resistors as follows:

  • Linear resistor
  • Non-linear resistor

Linear resistors

The resistors whose values change with change in applied temperature and voltage are known as linear resistors. There are two types of linear resistors:

Fixed resistors: These resistors have a specific value and these values cannot be changed. Following are the different types of fixed resistors:

  • Carbon composition resistors
  • Wire wound resistors
  • Thin film resistors
  • Thick film resistors

Variable resistors: These resistors do not have a specific value and the values can be changed with the help of dial, knob, and screw. These resistors find applications in radio receivers for controlling volume and tone. Following are the different types of variable resistors:

  • Potentiometers
  • Rheostats
  • Trimmers

Non-linear resistors

The resistor values change according to the temperature and voltage applied and is not dependent on Ohm’s law. Following are the different types of non-linear resistors:

  • Thermisters
  • Varisters
  • Photo resistors

Applications of Resistor

  • Wire wound resistors find applications where balanced current control, high sensitivity, and accurate measurement are required like in shunt with ampere meter.
  • Photoresistors find application in flame detectors, burglar alarms, in photographic devices, etc.
  • Resistors are used for controlling temperature and voltmeter.
  • Resistors are used in digital multi-meter, amplifiers, telecommunication, and oscillators.
  • They are also used in modulators, demodulators, and transmitters.



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