Difference Between Dielectric and Capacitor

A dielectric is a substance that doesn’t even allow electricity to pass, whereas a capacitor is an electronic appliance that retains electrical charges.

Because dielectrics are the polar opposite of conducting elements, they are often referred to as barriers or insulators.

Apart from the basic difference, this article highlights every small difference that is there between a dielectric and a capacitor.

This article will help you understand each of the terms with distinct definitions and a comparison table too.

Dielectric vs Capacitor

The main difference between a dielectric and a capacitor is that a dielectric is highly resistant to electrical charges and is a very strong insulating object that is used for the layering of the outer surface of a capacitor whereas a capacitor is a two-way conducting element that is widely used in electrical circuits. A capacitor is used for storing electrical energy in a circuit.

Dielectric vs Capacitor

A substance that is dielectric when it is good in shielding, or a poor carrier of electric charge.

When dielectrics are exposed to an electromagnetic current, they produce almost no current since, unlike metals and some alloys, they do not contain any loosely tied, or free, ions that may travel through the substance.

Electric polarisation, on the other hand, happens. Positive changes in the dielectric are pushed minimally in the direction of the applied field, whereas negative charges are transferred fractionally in a reverse way.

A capacitor is an electronic component for storing electricity that consists of two conductive materials in close vicinity. The concurrent capacitor is a small analogy of such a storage medium used in a circuit.

The capacitor does indeed have a charge Q if positive ions with an overall charge of +Q are loaded on one of the wires and an equal incidence of adverse charge -Q is placed on the other conductor.

Capacitors are useful in a variety of situations. They’re employed in electronic systems, for example, to ensure that data saved in huge computer memory isn’t lost in the event of a power outage.

Comparison Table Between Dielectric and Capacitor

Parameters of ComparisonDielectricCapacitor
MeaningA dielectric is an insulation substance that conducts electric charge poorly yet supports electromagnetic fields well.A capacitor is a multiple-way electrical component that consists of a dielectric insulator between two conductive substances.
Electrical Charge AffinityIt is electrically insulated and is a weak conductor of electric current.It is a good conductor and helps in storing electricity.
PropertyAbility to withstand strong electric current and heat too.To enhance the attribute of capacitance and store energy.
Used inIt is mainly used in fabricating capacitors.Used in electronic appliances and inverters.
CostA dielectric is very cheap in cost when compared to a capacitor.A capacitor is significantly costlier when compared to a dielectric material.

What is Dielectric?

A dielectric is an insulation substance that conducts electric charge poorly yet supports electromagnetic fields well.

It’s a medium or material that can endure high electric strain without causing significant conductivity.

When strain is increased, the dielectric stores energy in the form of an electric charge. When the tension is eliminated, the majority of this energy is maintained.

When a dielectric substance comes into touch with an electromagnetic current, it gets polarised and becomes more or less conducting.

A dielectric, like any substance, is made up of ions with opposite charges that equilibrium to maintain electroneutrality.

Positive charges are shifted in the presence of an electric field by dielectric loss, whereas negative charges shift in a reverse way.

Other electromagnetic phenomena are associated with the presence of dielectric substances.

In a dielectric medium, the interaction energy electrostatic force is less than in an atmosphere, but the energy contained in an electric field for every unit volume of dielectric material is larger.

The atoms are polarised, indicating they have a positively charged pole and a negative polarity that is aligned with the field direction since the following condition forces the electrons in each element to concentrate on one edge of the nuclei.

When a high enough electrostatic attraction is given to a dielectric, however, the forces that desire to drive the electrons can potentially defeat the force that shackles them to the elementary particle ie.

the nuclei of an atom, causing the electron particles to be ripped free.

What is Capacitor?

A capacitor is a multiple-way electrical component that consists of a dielectric insulator between two conductive substances.

It’s among the most basic passive components, capable of storing the application of an electric or an electromagnetic field.

It is their ability to store electrical power that distinguishes them. Along with resistor and inductive loads, a capacitor is one of the three essential components of an electrical circuit.

When power is placed across it, it retains the electrical charges and releases them as needed.

Capacitors are commonly found on elevated circuitry, but engineers are typically unaware of their electronic resistivity.

Capacitors come in a variety of sizes and shapes, but the essential design stays the same: two components which are good conductors transport equal but opposite charges.

Variable gas, sheet, mica, ceramic, polymer, tin oxide, and electrolytic capacitors are the most common dielectric materials used in capacitors.

Capacitors are even more vital as filters, diverting stray electric impulses and preventing damage to delicate electronics from electric surges.

Most power systems employ capacitors to store electrical power and then return it to the network when needed. A capacitor’s principal function is to store energy in basic words.

Capacitors come in a range of shapes and sizes, and they may be employed to perform a variety of tasks in different electrical circuits.

Main Differences Between Dielectric and Capacitor

  1. The primary function of a dielectric is to resist electric charge whereas the primary function of a capacitor is to store electricity.
  2. Dielectric is cheaper and easily available whereas a capacitor is very costly yet it is used in major electronic appliances.
  3. Every dielectric component is used in a capacitor but not every capacitor is a dielectric component.
  4. A dielectric is a good insulator but the capacitor acts as a general conductor with insulated components.
  5. A dielectric has more resistivity whereas a capacitor has more conductivity numerical values.
Difference Between Dielectric and Capacitor


A capacitor is an electronic component that can store lateral electricity for further usage in an electromagnetic field and is among the most basic components.

Capacitors can increase and enhance the capacitance impact. It is made up of two metal electrodes that are separated by a dielectric substance. An absorber or insulator is another name for the dielectric.

A dielectric on the other hand, like any other substance, is made up of ions with opposite charges that equilibriums to maintain electroneutrality.

The capacity of a dielectric designed to resist significant electric stress whilst dissipating minimal power in the form of heat is its primary characteristic.


  1. https://www.britannica.com/science/dielectric
  2. https://electronics.howstuffworks.com/capacitor.htm
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