The main function of a resistor is to limit the current of direct current and alternating current in a circuit, ensuring that each circuit has a corresponding circuit and guaranteeing its stability. So what are the performances of resistors, which play such an important role? The following text provides a detailed introduction.
The ways in which resistors play a limiting role in electronic circuits are mainly reflected in the following aspects:
1. Overload protection:
Current limiting resistors can prevent excessive current from flowing through sensitive components such as semiconductor devices, sensors, etc., thereby avoiding component damage due to current overload.
2. Current limit:
In some circuits, precise control of the current passing through specific components is required. A current limiting resistor can provide a fixed resistance value, thereby limiting the current within a predetermined safe range.
3. Stable working point:
In amplifier circuits, current limiting resistors can provide a stable bias current for active devices such as transistors, ensuring that they operate in a predetermined state.
4. Pressure divider effect:
The current limiting resistor can also be combined with other components to achieve voltage division function and provide the required voltage level for the circuit.
5. Power consumption dispersion:
In high-power circuits, current limiting resistors can disperse power and avoid concentration on a single component, thereby reducing heat concentration and improving the thermal stability of the circuit.
6. Reduce the current at the load end:
For example, adding a current limiting resistor to one end of a light-emitting diode (LED) can reduce the current flowing through the LED and prevent damage to the LED light.
7. Voltage distribution:
In a series circuit, current limiting resistors can help distribute voltage, ensure that each component receives appropriate voltage, and prevent any component from experiencing excessive voltage.
8. Stability:
Current limiting resistors can provide circuit stability, prevent rapid changes in current, and reduce circuit fluctuations and interference.
9. Preventing damage:
In specific situations, current limiting resistors can prevent excessive current from causing electrical appliances to burn out, providing protection.
The calculation formula for current limiting resistance can be determined according to Ohm's law, which is: R=(V-Vf)/I
Among them, R is the resistance value of the current limiting resistor, V is the power supply voltage, Vf is the forward voltage drop of diodes and other components in the circuit, and I is the current to be controlled. By using this formula, the required current limiting resistance value can be calculated to ensure that the current in the circuit does not exceed the safe range.
Recommended resistor selection: Ellon brand
