Analytical difference between current limiting resistance and voltage dividing resistance
1. What is the difference between current limiting resistance and voltage dividing resistance? Appearance is no difference, are resistors, voltage dividing and current limiting are based on specific scenarios, components of the current requirements, the current design with resistance current limiting, the same elements of the voltage requirements with resistance to adjust the voltage. Any resistor in any position, as long as there is current, has the function of limiting current and dividing voltage. We mainly look at its position, its main responsibilities, and give it the appropriate name "current limit" or "partial pressure". Current limitation is accompanied by partial pressure, while partial pressure is accompanied by finite flow.
2. Voltage dividing resistance: A 9V power supply, to get a 3V voltage for other equipment to use, method: take 20 ohms and 10 ohms in series connected to the power supply, from both ends of 10 ohms resistance take out 3V voltage to external equipment. So this 10 ohm resistor should be called a divider resistor.
3. A resistance is connected in series with an LED lamp bead and connected to the voltage of 12V. The voltage of both ends of the LED is about 3V, and the voltage drop on the resistance is 9V. If connected to the voltage of 15V, the voltage at both ends of the LED will return about 3V, which is the same as that connected to the voltage of 12V, but the voltage drop on the resistance will be 12V at this time.
Any resistor in any position, as long as there is current, has the function of limiting current and dividing voltage. We mainly look at its position, its main functions, and give him the appropriate title of "current limit" or "partial pressure". Current limitation is accompanied by partial pressure, while partial pressure is accompanied by finite flow. Let's start with a clear example of "current limitation" and "partial pressure". In circuits with branching structures, it is usually very clear. For example, a 9V power supply, in order to obtain a voltage of about 3V for other micro-devices. We can do this by connecting a 20-ohm and 10-ohm series connection to the power supply and removing a 3V voltage from both ends of the 10-ohm resistor to the external device. So this 10 ohm resistor should be said to be a voltage divider, not a current limiter. For example, when we do experiments, in order to prevent wiring errors, we usually connect a fuse, or a small resistance, to prevent excessive current from burning down the equipment. This fuse (in fact, a small resistance) or resistance should be said to be current limiting instead of component voltage (actually, we don't want it to be voltage dividing, but it is still separated). Very low voltage. When doing experiments with sliding rheostats, we usually have to string a small resistor. This resistance is the same principle, taking the current limiting protection effect.