回路

1. Origins, structure, and basic meaning

• Structure: 回路, read かいろ, here means a connected path through which electric current can flow.
• Basic usage: It is used for inspecting a faulty circuit or assembling a simple electrical circuit.
  • 故障した回路を調べるため電源を切った。

2. Common pitfalls and similar expressions

• The homophone 海路
  • 回路 and 海路 are both read かいろ; the former means a circuit and the latter a route by sea.