1.The difference between active components and passive components
(1) The characteristics of the work are different
Active components: need power to display their characteristics
Passive components: they do not consume electric energy by themselves, or convert electric energy into other forms of energy, and at the same time only need to input signals, and can work normally without external power supply.
(2) Different functions
Active components: generally used for signal amplification, transformation, etc.
Passive components: used for signal transmission, or "signal amplification" through directionality
(3) Changes are different
Active components: When the voltage changes, the resistance and impedance will change
Passive components: When the voltage changes, neither the resistance nor the impedance will change accordingly.
2.What are active components?
Active components, also known as active components, are components in circuit components that can perform data operations and processing. Including a variety of chips, such as active crystals, integrated circuits, image tubes and displays in semiconductor components, are all active components.
Generally used for signal amplification, conversion, etc. If an electronic component has a power supply inside it when it is working, this device is called an active component (active component). From the perspective of physical structure, circuit function and engineering parameters, active devices can be divided into two categories: discrete devices and integrated circuits.
Active Components Product Specific
(1) It also consumes electric energy
(2) In addition to the input signal, there must be an external power supply to work normally.
effect
Devices that rely on power as a basic working condition to complete their normal work are active components (active components), which are mainly front-end equipment, amplifiers in the transmission network, overcurrent branch distributors, feed amplifiers and optical transmitters, receivers wait. The amplifier is the most widely used active device in the access network. Its function is that when the TV signal is transmitted from the cable for a certain distance, the TV signal will become lower and lower due to the transmission attenuation characteristics of the cable. When the specified level is reached, an amplifier must be added to amplify the signal before sending it down. It plays the role of signal amplification and the purpose of transmitting TV signals to long distances.
3.What are passive components?
Passive components, also known as passive components, are electronic components that can display their characteristics without the need for an external power supply.
Features of Passive Components
(1) It consumes electric energy by itself, or converts electric energy into other forms of energy.
(2) Only need to input signal, it can work normally without external power supply.
Type introduction
Passive components mainly include resistors, capacitors, inductors, converters, gradienters, matching networks, resonators, filters, mixers and switches. An electronic component that can display its characteristics without the need for an external power supply. Passive components are mainly resistors, inductors, and capacitors. Their common feature is that they can work when there is a signal without adding power to the circuit.
Resistor: Resistor is a two-terminal electronic component made of resistive material, has a certain structural form, and can limit the passage of current in a circuit.
Therefore, the resistance can be used as an electric heating element to convert electrical energy into internal energy through the resistance of electrons between atoms. Resistors are mainly divided into three categories: fixed resistors, variable resistors, and special resistors (mainly including sensitive resistors), among which fixed resistors are most widely used in electronic products.
Capacitor: Capacitor is the most common basic electronic component. It stores and releases electrical energy in the form of static electricity.
The main functions of capacitors are charge storage, AC filtering or bypassing, cutting off or blocking DC, providing tuning and oscillation, etc.
According to different media, capacitors can be divided into ceramic capacitors, aluminum electrolytic capacitors, tantalum electrolytic capacitors and film capacitors.
inductance
Inductance is a component that can convert electrical energy into magnetic energy and store it. Its working principle is that when alternating current passes through the wire, alternating magnetic flux is generated inside and around the wire. Its main function is to isolate, filter or communicate with capacitors, Resistors and the like form a resonant circuit. Inductors are widely used in various electronic products such as computer equipment, communication equipment, video and audio equipment, consumer electronics, electrical automation equipment, and telecommunications broadcasting equipment.
Inductance can be divided into self-inductor and transformer.
