Circuit network - Kairomo

...In the case of trains, the current is sent from the substation through the transmission line to the overhead line, then taken into the train by the pantograph, passed through the current controller and the electric motor, and sent from the vehicle to the track and back to the substation. A circuit with branch points of current is called a circuit network, and Kirchhoff's law applies to the current distribution in a DC circuit network.
[power supply]
A device that has electromotive force that generates electric current is called a power source.

*Some of the terminology explanations that mention "circuit network" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…また，電車の場合には，変電所から送電線を通って架線に送られ，パンタグラフから電車にとり入れられ，電流制御器，電動機を通って車両から線路に流され変電所に戻る。電流の分枝点をもつ回路を回路網といい，直流の回路網の電流分布についてはキルヒホフの法則が成り立つ。
［電源］
　電流を生ずる起電力をもつ機器を電源という。…

※「回路網」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典 第２版について | 情報