### Basic

#### Unit

The unit of inductance
is the henry (symbol:
), but it is too large for normal usage. So a more common unit is `millihenrys`, abbreviated as
(
)

#### Inductor i-v equation

#### Feature

1. If a constant current flows in an inductor, then
   (a constant's derivative is 0), so in that case, there is zero voltage across the inductor.（Zero voltage means an inductor with constant current looks like a short circuit, the same as a plain wire.）

2. The current in an inductor does not (will not) change instantaneously.

So here we can see:

在电感元件中，电压的相位
超前电流的相位

Actually,
is just like a resistor value
in

So we call
`inductive reactance (感抗)`.
is the unit of him.

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