Schematic 6: Series-Parallel Wiring As we can see in the diagram above, Zspk2 and Zspk3 are in series (2). Thus we can add them and replace them with a new impedance which we can refer to as Zspk2'.

Two lamps connected in series with an open switch ... Two lamps connected in parallel with an open switch and a cell The circuit diagram shows a circuit with two lamps connected in parallel.