First of all, we cut in half the most common electronic components that everyone sees every day-LED. As far as electronic components are concerned, almost only LED lights are what we can see every day because everything else will be hidden by the packaging.Then cross-cut from the centre, you can see that the real luminous substance inside the LED is very small.
You should have seen a lot of diodes, but have you seen its internal structure?
This is a 2N3904 transistor, most of the inside is packaged, and its core component is only a small point.
What kind of capacitor is shown below, it is difficult to judge just by looking at the cross-section.
But cut it vertically, then everyone should be able to recognize it. This is the filter capacitor. We have all learned the principle of capacitance: two energized electrodes, and then close together, there is an electric field in between.
Coss section of a Polyester capacitor:
SMD capacitors are one of the most used capacitors today
What kind of capacitor is this? Let's take a close look at it! - Ceramic!
