# Analytical difference between current limiting resistance and voltage dividing resistance

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hqew.net / 2019-03-28 / Tech

What is the area of current limiting resistance and voltage dividing resistance?

Apparently, there is no area, all of them are resistors. Voltage dividing and current limiting are based on the specific scene. When components have requirements for current, they use resistors to limit current in current design, and when the same elements have requirements for voltage, they use resistors to adjust 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.

Voltage dividing resistance

A 9V power supply, to get a 3V voltage for other equipment to use, method: take 20 and 10 Euros in series on this power supply, from both ends of 10 Euro resistance to take 3V voltage to external equipment. So this 10-ohm resistor is called a divider resistor.

One resistor string and one LED lamp are connected to the voltage of 12V.

The voltage at 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 is about 3V, the same as connected to the voltage of 12V, but the voltage drop on the resistance is 12V.

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, the main responsibilities, 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. First, give an example of "current limiting" and "partial pressure". In circuits with branching structures, it is usually 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 taking a 20-Euro and 10-Euro series connection to the power supply and taking 3V voltage from both ends of the 10-Euro resistor to the external equipment. So this 10-ohm resistor should be said to be a voltage divider, not a current limiter. When we do experiments, in order to prevent wiring errors, we usually connect a fuse, or a small resistance, to prevent the current from burning through the equipment. This fuse (actually a very small resistance) or resistance, here we should say current limiting, not component voltage (actually we don't want it to divide voltage, maybe it's still very voltage dividing). Small). When doing experiments with sliding rheostats, we usually have to string a small resistor, which is the same way to take the current limiting protection effect.

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