然后他却发现了某些东西：一个除了由电阻，电容和电感组成的标准三重奏之外的第四个基本电路元件。
And he found something missing: a fourth basic circuit element besides the standard trio of resistor, capacitor and inductor.
电路或者电网络是由电阻、电感和电容等元件以某种方式连接而构成。
An electrical circuit or network is composed of elements such as resistors, inductors, and capacitors connected together in some manner.
外电路由串联电阻、电感和并联电容组成。
The external circuit consists of resistance connected in series with inductance and capacitance connected in parallel with them.
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