All complete circuits are loops of flowing electrons.
Basic Circuits
Direct Current (DC)
A flashlight battery has the ability to provide a flow of electrons but accomplishes nothing sitting on the shelf, since it is only stored energy. Only when the positive terminal of the battery is attached to one end of a light bulb and the other end of the light bulb is attached to the negative terminal of the battery do we have a completed circuit, and the light bulb emits light. In this circuit all of the electrons continue to flow in the same direction. This is called direct current (DC). Of course, if there's only one wire between the light bulb and the battery, or if there's an open switch, the circuit is incomplete. The electrons have to flow through ...
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