Hey Guys, I’m here with another article on Basic electronics. Today we’re going to discuss Electromagnetism. Electromagnetism is a very common topic that is discussed in electronics in about every task from designing circuits on a breadboard to on PCB. Also, while working with hall-effect devices and modules. Electromagnetism is responsible for electromagnetic induction and various other tasks like solenoid lock, solenoid valve, and many others. We’ll clear these all in today’s article.


What is Electromagnetism?

You all might be familiar with magnets we used to play around with. So the property that a magnet posses are magnetism. Similarly, an electromagnet is a property that a current-carrying coil or wire possesses due to the flow of charge or electrons through it. An electromagnet is the property of an Electromagnet, and how an electromagnet is created is very simple. Nothing to do more complex, just pass the current to a coil of wire, and you’ll see that iron fillings or metal objects are attracted toward the coil.

This property is called electromagnetism, and due to this electromagnetic induction, electromagnetic field, and flux are all related and responsible to this. We all might be familiar with Faraday law in lower classes and have learned much about this, but as time changes its applications and uses change. Also, Inductors are the basic component that is based on electromagnetism.

How does electromagnetism work?

An electromagnet is a simple coil and or a wire wound into a circle with more turns. When current flows through it, an Electromagnet is created due to the flow of charge through the wire. But not only this, due to flow the electromagnetic field is generated around the coil according to the right-hand curl rule. According to this rule put the thumb in the direction of current and curl the fingers, the curl of fingers shows the direction of the magnetic field.

North and South poles are created on the two sides of the coil p[perpendicular to the plane of the flow of the current-carrying loop. Observe the loop such that you see current flowing in a clockwise direction that side south is created and the other in anti-clockwise direction north is created.

Applications of Electromagnetism:

There are many applications of electromagnetism, some of them are mentioned below:

Solenoid valve & Lock:

These are the components that purely works on Electromagnetism. If you cut open these, you’ll see a coil of many turns inside these components. Also, the middle shaft is connected to fixed with a permanent magnet which is moveable and hence closes and opens the flow or lock. When you pass current through the coil due to electromagnetism, the permanent magnet is attracted towards the coil. Hence, the lock and valve open and closes as a result.


EMF stands for Electromagnetic Flux. This is the most important application of electromagnetism, which is used mostly around us. Transformers are the results or the best example of EMF. Due to EMF, EMI (Electromagnetic Induction) takes place. In Transformers, Primary and Secondary coils are used to Step-Up and Step-Down voltages.

Motors and Speakers works on same principle as well