A Resistor is a passive two-terminal electrical component that implements electrical resistance as a circuit element.

Resistance: opposition to flow of current.

Type of Resistors:

Carbon composition, Carbon pile, Carbon film, Printed carbon resistor, Thick and thin film, Metal film, Metal oxide film, Wirewound, Foil resistor

Types of windings in wire resistors

  • Common
  • Bifilar
  • Common on a thin former
  • Ayrton-Perry

Color Code:


  • capacitor(originally known as a condenser) is a passive two-terminal electrical component used to store energy electrostatically in an electric field.

Types Of Capacitor

  • Ceramic capacitors
  • Aluminum electrolytic capacitors
  • Film capacitors and Paper capacitors
  • Tantalum electrolytic capacitors
  • Super capacitors (Double-layer capacitors)
  • Silver mica and vacuum capacitors

Capacitance is the ability of a body to store an electrical charge. Any object that can be electrically charged exhibits capacitance.

A common form of energy storage device is a parallel-plate capacitor.

In a parallel plate capacitor, capacitance is directly proportional to the surface area of the conductor plates and inversely proportional to the separation distance between the plates.

If the charges on the plates are +q and −q, and V gives the voltage between the plates, then the capacitance C is given by

C = q / V

which gives the voltage/current relationship

I = C dv / dt


An inductor, also called a coil or reactor, is a passive two-terminal electrical component which resists changes in electric current passing through it. It consists of a conductor such as a wire, usually wound into a coil. When a current flows through it, energy is stored temporarily in a magnetic field in the coil. When the current flowing through an inductor changes, the time-varying magnetic field induces a voltage in the conductor, according to Faraday’s law of electromagnetic induction, which opposes the change in current that created it.

Types of Inductors:

  • Air core inductor
  • Radio frequency inductor
  • Ferromagnetic core inductor
  • Laminated core inductor
  • Ferrite-core inductor
  • Toroidal core inductor
  • Variable inductor


In electromagnetism and electronics, inductance is the property of a conductor by which a change in current in the conductor “induces” (creates) a voltage (electromotive force) in both the conductor itself (self-inductance) and in any nearby conductors (mutual inductance).The relationship between the self-inductance L of an electrical circuit in henries, voltage, and current is

v = L di / dt


  • In electronics, a diode is a two-terminal electronic component. it has low (ideally zero) resistance to current flow in one direction, and high (ideally infinite) resistance in the other.



  • transistor is a semiconductor device used to amplify and switch electronic signals and electrical power. It is composed of semiconductor material with at least three terminals for connection to an external circuit.