Electrical Circuit Basis: Series vs. Parallel Circuits Circuit Basics. In simple terms, all circuits work by providing a closed loop of wires through which electrical current can flow. As electrons flow through the wire loop from the source (hot wires) and back to the source (neutral wires) the current flow can power lights or How To Wire Lights in Series? Basic Electrical Wiring Series wiring for Lighting Circuits. These all Lights/lamps are connected in series. Each lamp is connected to the next one. The flowing current is same in all these incandescent bulb /lamps but the voltage are different. Good To know: This is not a suitable wiring for home or building.