English Dictionary

return path

noun

(electricity) The route by which a current or signal returns to its source, or to earth.

The return path is well-marked with signs.

意味（1）

(electricity) The route by which a current or signal returns to its source, or to earth.

The inner, or negative, rail is also known as the 'current return' rail, because electrical current needs a circuit - a return path to earth, in other words.