Circuit Components | Active Circuit Elements| Passive Ckt Elements

It is not possible to construct a circuit without element or component. The first essential element in the formation of any circuit is the circuit element. Circuit Elements are also called Circuit Elements or Circuit Components. In the previous discussion, we discussed the electrical circuit and its types. Today we will discuss the elements of the circuit or the Circuit Elements.

What’s going on in today’s discussion:

  • What is the Circuit Elements?
  • Active Circuit Elements.
  • Passive Circuit Elements.
  • Some explanations with examples.
  • The difference between Active Circuit Elements and Passive Circuit Elements

What is the Circuit Elements?

Circuit Components that can supply energy to a circuit or receive or absorb energy from a circuit are called Circuit Elements. Different electronic symbols are used to reproduce the components. Below is shown a basic circuit with two Circuit Elements:

circuit components


Depending on the supply and absorption of energy in the circuit, all the Elements of the circuit can be divided into two main parts:

  1. Active Circuit Elements 
  2. Passive Circuit Elements

Active Circuit Elements:

Active Circuit Elements are components that can supply or supply energy to the circuit. In addition, these Elements control the flow of electrons in the circuit. Any circuit must have at least one Active Circuit Elements.

Some examples of Active Circuit Elements:

  • Voltage source.
  • Current source.
  • Generator (Alternator and DC Generator).
  • Transistors (MOSFETS, FETs, and JFETs).
  • Diodes (Zener diodes, photodiodes, Schottky diodes and LEDs).

Voltage source

We know that a voltage source is a source whose load changes even though it provides a certain amount of voltage (eg battery).

circuit components
                                                        Voltage source

The voltage source is a notable example of Active Circuit Elements. When a current leaves the current from the positive terminal of a voltage source, the energy is supplied to the circuit. Since a voltage source (or battery) is continuously supplying energy to the circuit before being discharged, the voltage source or battery is, by definition, an Active Circuit Elements.

Current source

We know that the current source supplies the energy to the circuit or absorbs the energy from the circuit. Therefore, not all current sources are included in Active Circuit Elements, but they are considered as Active Circuit Elements when the current source is supplying energy to the circuit. Also, since the current source controls the flow of charges, it is included in the overall Active Circuit Elements.


circuit components

Transistors essentially increase the energy of a signal. Also, its amplification is able to control the charge flow in the circuit. So a transistor is also included in Active Circuit Elements.

Passive Circuit Elements:

Passive Circuit Elements is the complete opposite of Active Circuit Elements. Passive Circuit Elements are the components that can absorb energy from circuits that can absorb energy (such as heat, light, etc.) or store energy as electric fields or magnetic fields. These Elements do not require any external voltage.

Some notable examples of Passive Circuit Elements are:

  • Switch
  • L.D.R.
  • Register
  • Inductor
  • Capacitors
  • Thermistor
  • Transformers

Registers or resistor:

circuit components

The resistor or resistor is a Passive Elements because it cannot deliver any type of energy to the circuit. However, they only receive energy from the circuit and disperse it as heat through the flow of electricity. So we can call the register or resistor the Passive Circuit Element.


circuit components
                                                        The inductor

The inductor or inductor is a Passive Circuit Elements because the inductor stores energy as a magnetic field and subsequently supplies it to the circuit. That is why an inductor or inductor is included in the Passive Circuit Element.


circuit components

The capacitor is considered as a Passive Circuit Elements because it can store energy as an electric field. Since the capacitor does not supply or increase power, it is considered a Passive Circuit Element. Many think capacitors save energy and then supply it to the circuit. But it doesn’t actually supply energy, it basically saves energy for a little while for later use. Besides, this capacity is very limited and transient.


circuit components

The transformer is used almost to raise the voltage level. However amazing, the truth is, the power is kept constant. Transformer’s step-up voltage, power, energy, etc. When the primary and secondary side is the same, the transformer cannot supply or supply any energy. This is mainly because the transformer is also included in the Passive Circuit Elements.

The difference between Active Circuit Elements and Passive Circuit Elements

The table shows some of the major differences between Active Circuit Elements and Passive Circuit Elements –

Active Circuit ElementsPassive Circuit Elements
Active Elements can supply energy to the circuit.Passive Elements Receive or absorb energy from the circuit.
Active Elements can control the flow of electricity in the circuit.Passive Elements cannot control the flow of electricity.
External source or external source is required to operate Active Circuit Elements.No external source or additional energy required.
Gain is able to provideGain is not able to provide.
This is basically a one-way functionThis is basically a two-dimensional function
Examples of Active Circuit Elements like voltage source, current source, generator, transistor, diode, etc.Examples of Passive Circuit Elements such as switches, LDRs, resistors, inductors, capacitors, thermistors, transformers, etc.
Laptops are widely used in computers.Its use is MP-3, washing machine, etc.

In addition to the above two types, the components of the circuit are divided into Bilateral Elements, Unilateral Elements, Lumped Elements, and Distributed Elements.

Reference by,



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