1. Resistor
Function: current limit, partial pressure, electrical load
Characteristics: The resistance will be changed by the influence of the external environment.
2. Capacitor
Functions: oscillation, timing, signal filtering, signal coupling, starter, energy conversion
Features: DC to AC, high frequency to block low frequency, the voltage at both ends can not be abrupt, the current phase at both ends leads voltage phase
3. Inductor
Function: Oscillation, signal filtering, signal coupling, energy conversion
Characteristics: The current flowing through the coil through DC resistance AC, low-frequency resistance high frequency, and the current flowing through the coil cannot be abrupt, the voltage phase at both ends leads the current phase
4. Diode
Functions: rectification, detection, switching, voltage stabilization, light emission, photoelectricity, variable capacitance
Characteristic:
a. Positive characteristics. The first quadrant of the diode's voluptuous characteristic curve is called the forward characteristic, which represents the working condition of the diode when a forward voltage is applied.
b. Reverse characteristics. The third quadrant of the diode's voluptuous characteristic curve is called reverse characteristic, which represents the working condition of the diode when the reverse voltage is applied.
c. Reverse breakdown characteristics. When the reverse voltage continues to increase to a certain value, the reverse current in the diode will suddenly increase, we say that the diode reverse breakdown occurs at this time.
d. Transistor
Function: electronic switch, signal amplification
Features: Current control device, low input impedance.
e. Field-effect tube
Function: electronic switch, signal amplification
Features: voltage control device, high input impedance
7. Thyristor
Function: AC and DC electronic switch, AC step-less speed regulator
Features: Thyristor has the characteristics of a silicon rectifier device, can work under high voltage and high current conditions, and its working process can be controlled, widely used in controllable rectification, AC voltage regulation, non-contact electronic switch, inverter, and frequency conversion, Etc. in electronic circuits.
8. Single junction transistor
Function: Oscillation circuit
Characteristics: volt-ampere characteristics and negative resistance characteristics
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