A diode is a kind of transistor. To understand its function in layman's terms, it means that a one-way road can drive from one end to the other, but the other end cannot drive back. That is, it has the property of one-way conduction and has the function of rectification. Today, the application of diodes is not only in light-emitting, but more importantly, many light-emitting devices can realize it.

Measuring the quality of the diode: Use the 2-pole setting of the digital multimeter, and then measure it on the contacts of the multimeter, that is, the red needle contacts the anode of the diode, and the black contacts the abdominal muscles. Then the resistance is about 600 ohms, and then basically vice versa. The upper resistance is very large. If there is no digital display in the two measurements, it means it has been disconnected. If there is a sound of the delivery device in both measurements, it means it has been broken down. I would also like to remind everyone that this kind of forward resistance is generally around 600 ohms. It is normal.
Detailed explanation of the use of diodes in circuits: If diodes are connected in series in a circuit, what is the voltage and voltage distribution like? In fact, this voltage distribution also depends on the current flowing through it, so this voltage distribution is basically very average, so this loss is still very unique, so it is basically not used in series solutions, and is generally used in parallel. In a parallel circuit, this deviation is as small as possible, and as the voltage increases, we can see that this aspect of withstanding a lower current can show effects in more circuits, so when choosing this type of diode, you must understand the characteristics of the diode.
The test of this buck circuit can show an understanding of the battery and resistor, and we can see what the working current is. Especially at this pressure, we can see that the impact of this voltage is still very hateful. The impact of the diode in the circuit is still very obvious, especially in the forward voltage in the switching circuit. After all, the role of this diode in many power switches, because of the difference in switching circuits, this voltage impact is very unique. After all, the internal resistance is small when it is turned on and large when it is turned off.

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