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2022
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Are resistance dividing and resistance bucking the same? Difference between resistor divider and resistor step-down
The difference between resistor divider and resistor step-down
Let's start with voltage dividing. Generally speaking, a voltage dividing circuit has to be composed of a series circuit with two resistors greater than or equal to each other. For example, a crystal transistor requires a voltage of 0.4 to 0.6V between be's. For this purpose, two resistors are set up in the circuit to divide the voltage between the upper and lower bias. In addition, for signals that are too strong, resistors can also be used to reduce the voltage. There is also the volume potentiometer used in radios, which is also a variable voltage divider. It can be equated to two resistors that change inversely in proportion to each other and can be rotated to obtain different amplitudes of signal voltage for volume control purposes. As can be seen from these examples of voltage dividers, what they have in common is that they only provide voltage to the outside world, while the current is very small. This is why they are more appropriately called voltage divider circuits.
This is not the case with step-down circuits, which can be completed by a resistor in series with the load, and require a certain current output after the step-down. For example, if we have a 12V 12W light bulb that needs to be connected to a 15V supply, we need a 3Ω resistor to bring the voltage down to 12V, which is a typical example of a buck resistor.
Of course this resistor divides the 3V voltage, so you can call it a voltage divider; this resistor limits the high current generated by connecting a 12V bulb to a 15V supply, so you can also call it a current limiting resistor. These are the different conclusions that can be drawn from different perspectives.
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