根据电阻和电容计算电阻-电容电路的RC时间常数。
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RC时间常数，用希腊字母 $\tau$ 表示，代表充电时电容器两端电压达到其最终值约63.2%所需的时间，或放电时衰减到约36.8%所需的时间。
$$ \tau = R \times C $$其中 $R$ 是电阻（欧姆），$C$ 是电容（法拉）。结果以秒为单位。