If there are no branches then it's a series ... In parallel circuits different components are connected on different branches of the wire. If you follow the circuit diagram from one side of ...

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.

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However, this is a great time to look at the difference between series and parallel circuits ... With an open circuit, there is no longer a current. Here is the new diagram.