# Temp Extra Info

This is just a temp storage of extra info.

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（用MD的好處是可以專心在內容的編輯，而不需要花時間在排版。MD 的軟體會自動排版。）

## Extra
[電容](https://i.imgur.com/G90gazG.png)
[電感](https://i.imgur.com/QuAAIwp.png)
[電感2](https://i.imgur.com/QLFhGtR.png)
[電感3](https://i.imgur.com/CehV4gS.png)
[交流電的電路符號](https://i.imgur.com/80B3SrV.png)
[直流電的電路符號](https://i.imgur.com/xBC6psu.png)

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## Equation Example
(not important, just for MD testing purpose)

% Aligned environment
$$
\begin{equation}
\begin{aligned}
f(u) & =\sum_{j=1}^{n} x_jf(u_j)\\
& =\sum_{j=1}^{n} x_j \sum_{i=1}^{m} a_{ij}v_i\\
& = \sum_{j=1}^{n} \sum_{i=1}^{m} a_{ij}x_jv_i
\end{aligned}
\end{equation}
$$

% Remove numbering in multiline equations 2 (doesn't work in HackMD)
$$
\begin{flalign*}
f(u) & =\sum_{j=1}^{n} x_jf(u_j)&\\ \nonumber
& =\sum_{j=1}^{n} x_j \sum_{i=1}^{m} a_{ij}v_i&\\ \nonumber
& =\sum_{j=1}^{n} \sum_{i=1}^{m} a_{ij}x_jv_i
\end{flalign*}
$$
\begin{equation}
\begin{aligned}
\end{aligned}
\end{equation}

電容與電感中所儲存 **能量的變化** 是 **功率** \(p\)
$$p_{abs} = \frac{d}{dt} \cdot (v_{C}^2) \cdot C$$
$$p_{abs} = \frac{d}{dt} \cdot (i_{L}^2) \cdot L$$




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Extra




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