What are the characteristics of the hollow coil inductors? Hollow coil, that is, when the current in the coil changes, the hollow coil will induce electromotive force, and this induction electromotive force will resist the passage of the current. It's abstract, so let's take an analogy.

The inductance is like a spring. When we want to tighten the spring, the spring gives us a bounce, and the hollow coil means that the spring of the hollow coil is holding back and we tighten the spring. The induction electromotive force is like the bounce of a spring. When the current in the coil attempts to be changed, the induced electromotive force will stop it and let the current stay as close as possible to a relatively balanced situation.

Then, assuming the spring is tight, the spring will return to its original shape after we release it. Is the inductance of the hollow coil the same? The answer is certain.

The inductor current storage curve can be stored for a big characteristic of energy is inductance, hollow coil when the current in inductor inductor current is too high, in order to keep the balance of nature will be part of the energy storage, when the current back to the initial condition, the inductance can release some energy. Just as a spring stores some of its potential energy, the spring does not go back to its original shape at once. It vibrates repeatedly until it releases the potential energy completely before returning to its original shape.

Another characteristic of mutual inductance inductance is mutual inductance, the current of one loop attacks a magnetic field, the hollow coil, and the magnetic field will affect the second loop, this kind of interaction, we call it mutual inductance. The most typical use of mutual inductance is the transformer, which we often see in our daily life.