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What are the common electronic components?


Active devices, passive devices, "source" refers to the "drive source" or "curated source", only this "source "for electronic devices often from the" power "so there is a misuse, said "misuse" because the technical language must be rigorous, the source is not equal to the power, as the voltage source, current source can not simply be called power reason The same. In English, active device and passive device are Active Device and Passive Device respectively, which do not generate ambiguity in themselves, and there is no corresponding original context in Chinese, while the principle of translating foreign languages, especially the classical principle, is to try to use local near-sense words to carry out a certain meaning or specific reference to things through connotation constraints or redefinition, which often gives rise to meaning, and sometimes it is really necessary to to standardize the concept by reading the original text.

The key to distinguish between active and passive devices is whether the port characteristics of the component depends on the external source of currents, yes, it is an active device, non-passive devices, the basis for consideration of ideal components to avoid the interference of process factors. For the inseparable combination of components, if there are active devices in the composition, the whole is considered as "active".

For an ideal resistor or resistor network, its VA characteristics do not change with external currents, and even without external currents its characteristics still hold, so it is independent of external currents, so the resistor is a passive device.

For an ideal crystal transistor, its characteristic Ic=BIb to be established must be given a specific curation, otherwise it can not be established (such as reverse bias CE junction voltage), so its characteristics are subject to external curation, so the crystal transistor is an active device.

For an ideal crystal diode, considering its port characteristics alone, it is also obviously independent of external curation, as a matter of fact, should be passive devices, but there are many types of diodes, such as the electro-optical characteristics of LEDs, photodiodes, the relationship between the reverse conductivity and the incident light intensity characteristics, etc., when considering these characteristics can not be replaced by a simple ideal diode model, the external curation source in this is a necessary condition (Note that the source is not just an electrical "source"), coupled with the complexity of the diode application, the diode is generally classified as an active device, but the ideal diode is still a passive device, which is a special place, I personally hold this view.

In electronics is the following classification.
1, passive devices (passive devices, active components), also called linear components, in the circuit of the electrical characteristics of a straight line.
2, active devices (active devices, active components), also known as linear components, in the electrical characteristics of the circuit is not a straight line.
When analyzing the functions and technical parameters of electronic circuits, electronic components are generally divided into two categories: passive and active devices.

1. A simple definition of passive devices
If an electronic component operates without any form of power source inside it, the device is called passive.
By the nature of the circuit, passive devices have two basic characteristics.
(1) Self or consume electrical energy, or convert electrical energy into other energy in different forms.
(2) Only the input signal is required, and no external power supply is needed for proper operation.
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