Any resistance at any position, as long as there is current, has limited current and voltage sharing effects. We mainly look at its location, its main functions, and assign it the appropriate professional title of "current limiting" or "voltage sharing". At the same time as limiting current, there is partial pressure, and at the same time as partial pressure, there is limited current.

    Everything is dialectical and unified. Any resistance at any position, as long as there is current, has limited current and voltage sharing effects. We mainly look at its location, its main functions, and assign it the appropriate professional title of "current limiting" or "voltage sharing". At the same time as limiting current, there is partial pressure, and at the same time as partial pressure, there is limited current. Let me give an example of a clear distinction between "current limiting" and "partial pressure". In circuits with branch structures, it is usually very clear. For example, a 9V power supply is used to obtain a voltage of approximately 3V for use by other micro devices. We can do this by connecting a 20 ohm and 10 ohm resistor in series to this power source, and taking a 3V voltage from both ends of this 10 ohm resistor to the external device. So this 10 ohm resistor should be said to be a partial voltage effect, not a current limiting effect. For example, when conducting experiments, in order to prevent wiring errors, we usually connect a fuse or a small resistor to prevent excessive current from burning the equipment. This fuse (actually a small resistor) or resistor should be referred to as current limiting, not as component voltage (in fact, we really don‘t want it to be divided into voltage, but it still divides a very small voltage). When conducting experiments with sliding varistors, we usually need to string a small resistor, which follows the same principle as using current limiting protection. Here is another example that is not very clear. A 9V power supply needs to be connected in series with a resistor to light a 6V small light bulb, which bears a voltage of 3V. We usually say that this resistor serves as a voltage divider.