电工每天都有很多事情与电流、电压、电阻以及电力打交道。
Electricians have a lot to do with current, voltage, resistance and power every day.
焦耳小偷电路是一个相当简单的转换电压很低，像从死 电池，到一个足够高的振荡电压做点有用的事情。
Many versions of the Joule Thief circuit have you winding the transformer yourself, but since I'm lazy, I bought one.
焦耳小偷电路是一个相当简单的转换电压很低，像从死 电池，到一个足够高的振荡电压做点有用的事情。
Many versions of the Joule Thief circuit have you winding the transformer yourself, but since I'm lazy, I bought one.
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