A current-limiting resistor is a protective resistor connected in series with a load to prevent excessive current that could damage electrical components. By increasing the total circuit resistance, it effectively reduces the current flow. It can also serve as a voltage divider in some cases. In general, any resistor connected in series with a device to limit current, without serving other functions, can be considered a current-limiting resistor.
Many electronic components have limits on the maximum input current they can safely handle. If the input current is too high, the components may malfunction or even be damaged. To control the current, a chip resistor (surface-mount resistor) is often added at the input end to reduce current intensity and prevent potential risks.
Working Principle:
In the circuit, RL represents the load resistor, R is the voltage-regulating or current-limiting resistor, and D is a Zener diode. According to voltage stabilization circuit principles, when the input voltage remains constant, a decrease in RL causes the current through RL to increase, while the current through D decreases accordingly.
A current-limiting resistor is used to reduce the current flowing through a load. For example, adding a current-limiting resistor in series with an LED can reduce the current passing through the LED, thereby preventing it from being damaged.
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