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by Paurnima janrao


Resistor is defined as

passive electrical components with two terminals which are used for either restricting or regulating the go with the flow of electric modern-day in electric circuits.

The primary purpose of the resistor is to reduce the modern-day drift and to lower the voltage in any precise part of the circuit. It’s miles made of copper wires that’s coiled round a ceramic rod and the outer part of the resistor is lined with an insulating paint.

The SI unit of resistor is ohm.

symbols of resistor:

Each resistor has one connection and two terminals. 

Types of resistors:

Resistors are available in exceptional sizes and styles. Common types which 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 simple types of resistors as follows:

  1. linear resistor
  2. non-linear resistor

Linear resistors:

The resistors whose values trade with alternate in carried out temperature and voltage are referred to as linear resistors. There are  types of linear resistors:

fixed resistors: those resistors have a selected value and these values cannot be modified. Following are the specific types of constant resistors:

  • carbon composition resistors
  • wire wound resistors
  • thin movie resistors
  • thick film resistors

Variable resistors: those resistors do not now have a particular fee and the values may be changed with the help of dial, knob, and screw. Those resistors discover programs in radio receivers for controlling volume and tone. Following are the exclusive styles of variable resistors:

  • potentiometers
  • rheostats
  • trimmers

Non-linear resistors:

The resistor values alternate according to the temperature and voltage implemented and aren’t always depending on ohm’s law. Following are the extraordinary styles of non-linear resistors:

  • thermistors
  • varisters
  • picture resistors

color coding of resistors:

Resistors might not display the value outside however resistor color patterns through their resistance can be calculated. PTH (plated-through hole) resistors use a color-coding system (which definitely adds some flair to circuits), and smd (surface-mount-device)resistors have their own value-marking system.

Colour Colour code
Black 0
Brown 1
Red 2
Orange 3
Yellow 4
Green 5
Blue 6
Violet 7
Grey 8
White 9

Resistors in series:

Resistors are said to be in series when current flowing through all of the resistors is the same. Those resistors are related from head to tail in series. The overall resistance of the circuit is equal to the sum of character resistance values.

Resistors in series formula

Rtotal = r1 + r2 + r3 +……+rn

In which,

r-total is the sum of all of the character resistances

Resistors in parallel:

Resistors are stated to be in parallel while the terminals of resistors are linked to the equal  nodes. Resistors in parallel share the same voltage at their terminals.

Resistors in parallel formulation



1/rtotal is the sum of all of the individual resistances

Applications of resistor:

Following are the applications of resistors:

  • wire wound resistors locate utility wherein balanced current control, high sensitivity, and accurate measurement are required like in shunt with ampere meter etc.
  • Photo resistors find software in flame detectors, burglar alarms, in photographic devices, and so forth.
  • Resistors are used for controlling temperature and voltmeter.
  • Resistors are utilized in digital multimeter, amplifiers, telecommunication, and oscillators.
  • They’re extensively utilized in modulators, demodulators, and transmitters.

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