It does; positive electricity always flows from the metal which is acted upon most powerfully, and negative electricity from the other.
What do we mean when we speak of a galvanic circuit?
The connection of the two metals in the battery, so that the positive and negative electricities can meet, and flow in opposite directions.
At what point in the circuit will the manifestations of electricity be most apparent?
At the point where the two currents meet.
What is meant by the poles of the battery?
The two metals forming the elements of the battery are generally connected by copper wires; the ends of these wires, or the terminal points of any other connecting medium used, are called the poles of the battery.
Thus, when zinc and copper poles are used, the end of the wire conveying positive electricity from the zinc would be the positive pole, and the end of the wire conveying negative electricity from the copper plate would be the negative pole. Faraday describes the poles of [914] the battery as the doors by which electricity enters into or passes out of the substance suffering decomposition.
A very simple, and at the same time an active, galvanic circuit may be formed by an arrangement as represented in the accompanying illustration. The current of positive electricity, when the circuit is closed, passes from the zinc, through the liquid, to the copper, and from the copper, along the conductors to the zinc. A current of negative electricity traverses the circuit also, from the copper to the zinc, in a direction precisely reversed.
By what chemical action can the greatest abundance of galvanic electricity be developed?