Have you ever thought why there exists a tiny little cylinder on your laptop charger? Today we are going to reveal the secret behind it.
These cylindrical shaped bumps are not only found in laptop chargers but also in many other power cords, such as: mouse, keyboard, monitor cables, printer cables etc. These bumps are theoretically called as ferrite beads or ferrite chokes. Here is how they look like:
What would happen if the charging cable was not designed to have the little cylinder? We all know that an electrical current passes through a charging cable in order to power up any device battery. Due to this electric current in the cable, it creates radio energy within itself and emits it in the form of waves outside the cable.
This phenomenon is similar to how an antenna works i.e. converting an electrical power into radio energy and vice versa. Just like an antenna, this cable transmits and receives signals to or from surrounding gadgets with same capability. Due to this, the electric power gets used in unnecessary function and hinders charging the actual device. In addition, these signals can interfere with other electronic devices resulting in noisy signals such as a nearby radio gives distorted voice or does not tune up to a channel.
This is why a ferrite bead is inserted to a charger. It has the capability of blocking the emission of radio waves from the cable so that it uses electrical power for charging purpose only. A typical ferrite bead is formed through an insulated wire wrapped around a magnetic material just like it is shown in the picture below. In our case, the charging cable is the insulated wire and the ferrite cylinder is the magnetic material which together form a special kind of lump for the charger.
This proves the fact that in science little details matter the most or otherwise it would have been a chaos.