What is the self-inductance of simple words

Hello dear visitors and guests my channel! We continue to talk to you just about difficult things, and today we will talk about this curious physical phenomenon as the self-inductance.

definition

So, let's first remember (learn) self-inductance definition:

Induction - a phenomenon of occurrence of EMF induction in the conductive circuit by changing the current flowing through the circuit. Clear? To be honest, not really. Let's understand what the self-inductance in a simple way.

We understand in a simple way

So let's start with a search for analogies in the world around us: Imagine a freight train, consisting of barrels filled with, for example, our black gold (oil). You know very well that a freight train can not immediately reach maximum speed, and the first time most of the energy locomotive expended to overcome inertia composition (set of kinetic energy) and a small portion at overcoming friction.

Similarly, during braking, the composition may not stop immediately, it takes time to use up the stored kinetic energy.

Now let us turn to the electric circuit from consideration of the railway.

Similar processes take place in a closed circuit when applying and disconnecting the voltage.

For a better understanding let's consider just such a scheme of the experimental setup Joseph Henry, where the coil is the "freight train".

If we collect such a setup and experiment, we can see that one of the lamps (one in front of which is located a coil in the circuit) turns slower than the other.

And here's why:

So, the key is closed.

By circuit current starts to flow. At this point in the coil begins to form an electromagnetic field, and the larger the current flows, the greater the field is formed.

It turns out that the coil is in a changing magnetic field, which means that changing the magnetic flux penetrating forms induced emf and induced current, respectively. And, according to Lenz's rule, the generated current will be directed so that its own magnetic field to prevent a change in magnetic flux which penetrates the coil.

That is, put simply generated current will be directed against the current from the power source, thereby providing resistance to it (as well as the inertia of the carriages resists locomotive).

This means that the current has reached its maximum value immediately.

Now let's consider the situation when the key opens.

In this situation, the current in the circuit begins to decrease, which leads to a decrease in magnetic flux through the coil. It also generates the self-induction electromotive force and the induced current, only in this case the induced current is directed in the same direction as the current in the circuit, which leads to slowing down decreasing current in the circuit.

That is, the current in the circuit can not disappear immediately (composition not stop immediately), since there are stored the energy in the magnetic field that you want to spend (to repay the kinetic energy of the composition braking).

Thus, for any change in the current in the conductor formed by electromagnetic induction, which generates induction current flowing in such a manner as to prevent any change in the current own Explorer. This is the self-inductance - the special case of electromagnetic induction.

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