When the current passes through the resistor, it will convert all (or part) of the electrical energy into internal energy, which will generate heat. The use of resistors in multi-stage amplifier circuits can prevent harmful low-frequency interference, which play a decoupling effect.ĩ) Convert Electrical Energy into Internal Energy (Heating)
Resistor and capacitor form an RC circuit, which can be combined in parallel and in series.Ĭonnecting a resistor in parallel in the LC resonant circuit can reduce the Q value, at this time, resistor plays a damping effect. At this time, the resistor plays a negative feedback role in the circuit. Used in the resistance between the base and collector of the transistor, then the feedback branch of the negative feedback circuit is formed in the circuit. The role of the resistor in the circuit at this time is to provide a bias voltage. At this time, the power supply provides a bias voltage to the base through the resistor, and the resistance can determine the bias voltage.
In the transistor circuit, the resistor is connected between the base of it and the working voltage. At this time, the role of the resistor is to divide the voltage.
#3 resistor npn transistor amplifier series#
In this case, a resistor with suitable resistance can be connected in series in the circuit to share a part of the voltage, therefore the electrical appliance can work at the rated voltage. If the power supply is higher than it, the electrical appliance cannot be directly connected to the power supply for a normal operation. Generally, electrical appliances are marked with a rated voltage value. The function of this resistor is to divide current. The resistor is connected in parallel to the component or circuit that needs to be shunted, and the voltage does not change. In order to prevent the components connected in series from being burnt out by the excessive current and to ensure the normal operation of the electrical appliances, a variable resistor can usually be connected in series in the circuit. Also there are different resistors and switches combined to produce voice-activated switches, photosensitive switches, infrared switches and so on. According to Ohm's law, through calculations, resistors in parallel and series connections can be used to achieve the desired current and voltage.
In short, the function of resistance is to limit current, divide current, divide voltage, and convert electric energy into internal energy (heating) in the circuit. Ⅲ The Role of Resistors in Transistor Circuitsģ.1 Why Should a Resistor Be Added to the Base of the Transistor?ģ.2 Pull-down Resistor in Transistor Circuits Ⅱ Three Basic Principles for Resistor Selection It can also be said that it is an energy-consuming element, because internal energy is generated when current passes through it.įigure 1. The main physical characteristic of a resistor is to transform electrical energy into thermal energy. On one hand, the resistance that cannot be changed is called a fixed resistor, on the other hand, the resistances of potentiometers or variable resistors are changeable. After it is connected to the circuit, the resistance is fixed, which can limit the current through the branch connected to it. A resistor is a passive two-terminal electrical component.
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