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What is the difference between an inductor and a capacitor ?

An inductor and a capacitor are both passive electronic components used in circuits, but they have distinct functions and characteristics. Let’s delve into the differences between these two components.


An inductor is a coil of wire wound around a core, often made of magnetic materials. When an electric current flows through the coil, it generates a magnetic field around it. The core material enhances the inductor’s ability to store energy in the form of this magnetic field. The key property of an inductor is its ability to resist changes in the current flowing through it. In other words, it opposes any abrupt changes in the flow of electric current.

Inductors are commonly used in applications where the control of current is essential, such as in filters, transformers, and inductance-based sensors. The unit of inductance is the henry.


A capacitor, on the other hand, consists of two conductive plates separated by an insulating material known as a dielectric. When a voltage is applied across the plates, an electric field is established, and the capacitor stores electrical energy in this field. Unlike an inductor, a capacitor tends to resist changes in voltage. It releases stored energy when the voltage across its terminals changes.

Capacitors find widespread use in electronic circuits for energy storage, smoothing voltage fluctuations, and filtering signals. The unit of capacitance is the farad.


  1. Storage Mechanism: Inductors store energy in a magnetic field, while capacitors store energy in an electric field.
  2. Response to Changes: Inductors resist changes in current, and capacitors resist changes in voltage.
  3. Symbolic Representation: In circuit diagrams, an inductor is represented by a coil or a series of loops, while a capacitor is denoted by two parallel plates.
  4. Unit: The unit of inductance is the henry for inductors, and the unit of capacitance is the farad for capacitors.

Understanding the distinctions between inductors and capacitors is crucial for designing and analyzing electronic circuits, as they serve different purposes in circuit applications. Combining both components strategically can lead to more sophisticated circuit designs with specific functionalities.

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