Since a network is composed of passive circuit elements, we must first define the electrical characteristics of these elements.
由于一个网络是由各种无源的元件所构成，我们必须先确定这些元件的电特性。
If the network contains no energy sources, such as batteries or electrical generators, it is known as a passive network.
如果在网络中没有电源，例如电池或者发电机，则称为无源电路。
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