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  THE BASICS OF SERIES CIRCUITS A circuit is a path for electrons to flow through. The path is from the positive terminal of a power source, through the various components and on to the negative terminal (Conventional Theory) or, if you prefer from the negative terminal to the positive terminal of the power source (Electron Theory) . Think of the circuit as a circle. The paths may split off here and there, but they always form a line from positive to negative.   If you look at the diagram below, you will see the basic structure of a simple circuit. If we break a circuit down to its basic blocks, we get:   1.     A Power Source: battery 2.     A Path along which the electricity will travel: wire. 3.     A Load: lamp 4.     A Control: switch   Series Circuits A series circuit is one with all the loads in a row. There is only ONE path for the electricity to flow. So, as you can see this is a circuit where there is only one path from the source through all of the load