Coming from an IT background to an AM transmitter site might leave you with a world of questions. Mark Persons explains the basics.

A series circuit has all the components in one loop connected by wires, ... or parallel to, each other. This simple circuit is like a one-bulb version of a building’s lighting circuit. ...

The current flowing in a series circuit is the same everywhere. Figure caption, A series circuit with two bulbs and one cell. The ammeter will read the same at points 1, 2 or 3. In series circuits ...