### 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`串`或`并`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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