What's the purpose of 3 basic components in AP circuit?

If we need to block DC, we use a capacitor. 它具有充放电特性和阻止直流电流通过,允许交流电流通过的能力。

If we need to block very high frequency AC, we use an inductor. 如果电感器在没有电流通过的状态下,电路接通时它将试图阻碍电流流过它;如果电感器在有电流通过的状态下,电路断开时它将试图维持电流不变。类似于稳(压)器。

If we need to design a filter, we (can) use resistors, capacitors and inductors.


As the previous

As far as I see, no matter in AC or DC, ohm's law is always useful:

1

  • But for different components, R is different.

    In Resistor, R is

    In Inductor, R is

    In Capacitor, R is

  • And of course, they becomes different in AC circuit with complex number(复数)

    becomes

    becomes

    becomes

  • Don't ask me how these things come from, it's too complex for me to answer. Just remember it.

2

For each items, we no longer call them , instead, we call them (复阻抗)

如果几个阻抗通过合在一起, we call them 复阻抗

3

于是,和 DC analysis 一样,串联电阻相加,并联电阻

只是运算上要注意很多事,比如:

If you want to do some addition or subtraction, convert your equations to another 复数形式 first (like )

4 * (not important)

如果得到的复阻抗,虚部为正,电感器起主导作用,整体电路呈感性

如果得到的复阻抗,虚部为负,电容器起主导作用,整体电路呈容性

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