This game is easy if you think in reverse.

An electron is a part of an atom.

It seems that this river is flowing backwards.

You must not go in the reverse direction on this road.

You must not proceed in the reverse direction on this road.

Please look at this parts list.

I measured the voltage using a voltmeter.

I measured the current using an ammeter.

This old science book explains the concept of circular current in detail.

This device operates using a circular current.