Inductance Formula Analysis

An inductor is a passive element. The inductor is used in all electrical circuits. We already posted an article about Inductor and Inductance you can read. Today we are going to know all Inductance Formula. Inductance formula is very very important for us.
So let's start Inductance Formula from basics.

We already know that when the flow of current through a coil is changing with time an EMF is induced in the coil and the induced EMF is proportional to the rate of change of the flowing current with time.

so we can write,

Now, 

Here L= Inductance
This is the basic inductance formula.

The equation of current in Inductor is,



The formula of power in Inductor is,


The energy storing formula of Inductor = 

The Formula of self-inductance,
Here, L= self-inductance
         N= No. of turns
         l (small L)= length of the wire
        A= area of each turn

Inductance Formula of Series Inductor circuit:

Inductance Formula of Parallel Inductor circuit:

If 'n' no of inductors are connected in parallel the equivalent inductance will be,
As it is a parallel the voltage across each inductor will be the same, but current will be different.
The current in each inductor is,
According to Kirchhoff's Current Law,

     The total current               i=i₁+i₂+i₃+.........+i_n

What is Inductor, What is Inductance, Inductor Types, Use of Inductor.

Most of Student, as well as most of the people, have many questions about Inductor, like What is Inductor? What is Inductance? Types of Inductor and Use of Inductor.
Even after reading many books, blogs we have many doubts about the basics of an Inductor. Before reading the details about an Inductor we must have clear knowledge about the basics of an Inductor.
We do always try to focus to give basic knowledge.

In this post, we only discuss the basics of an Inductor. Let,s known, What is Inductor?
                               A simple wire having a number of turns can be called an Inductor. You may have a question that why it is called inductor. The answer is because it has the property that is called Inductance. Now you have one more question that what is Inductance? The answer is Inductance is a property of a conductor which try to oppose the change in current which flows through this conductor. 
                            
                            Now, this is the time to know how it opposes the change in current (This 'change in current' means the changes in magnitude or direction). When a current flowing through any conductor or wire it creates some magnetic flux. If the current not changing then the produced flux also constant. If the conductor having a number of turns and the current is changing then an EMF will be Induced as the flux linking with the turns changes. This induced EMF will try to oppose current. 
Actually, Inductance can be called as Self Inductance. In the case of DC, the current is constant so the inductance property does not exist. But in the case of AC, the magnitude and direction of current not constant so the Inductance exists. 

                         One very important thing that when we give DC supply to an Inductor flux will be produced. Then it is called an Electromagnet.
An inductor is a passive element. It can store energy in the form of the magnetic field. It can block the AC.
The unit of inductance is Henry.

Application of Inductor:

(1) It is used in filter circuits.
(2) It is used as an electromagnet.
(3) It is used in resonance circuits.

In this post, we only discussed What is Inductor? What is Inductance? Application of Inductor which is a very important topic before reading the details of an Inductor. 
Read also:

What is capacitor, how does a Capacitor works, types of capacitor, application of capacitor.

image from www.maxpixel.net

A capacitor is a passive element, which uses in both electrical and electronic circuits.
A capacitor is an element which can store charge. The function of a capacitor is charging and discharging in a few time. Let's what inside a capacitor and how it works.

A capacitor has two metallic plates. And there is a dielectric material between the two plates. When the capacitor is connected to a voltage source, an electric field is created. positive charges are collected by one plate and negative charges are collected by another plate. So a capacitor store charge by creating an electric field. when a capacitor collects charge is called charging and when the capacitor releases the charge is called discharging.


The amount of electrical energy stored by the capacitor is called capacitance of that capacitor. The unit of capacitance is Farads(F).
If the capacitance is C, the applied voltage is V, and the charge is Q then
                                                          C=Q/V

There are many different types of capacitor,

1. Ceramic capacitor
2. Electrolytic capacitor
3. Polystyrene Film Capacitor
4. Polycarbonate capacitor
5. Polypropylene Capacitor
6. Glass capacitors
7. Supercap
8. Silver Mica Capacitor
9. Tantalum capacitor
10. Metallised Polyester Film Capacitor

Application of capacitor,

1. The capacitor is used for filtrate DC output of the rectifier.
2.  The capacitor is used for audio frequency coupling.
3. The capacitor is used in Tuned circuits.
4. The capacitor is used for power factor improvement.

Read Also:

• What is Resistor?
• What is Inductor?