High School Physics Practice Test

Understanding how components are connected is the key idea. When all parts of a circuit are arranged in a single line, sharing the same current, that’s a series setup. When all parts have the same voltage across them, and currents split in different branches, that’s a parallel setup. But if a circuit contains some parts connected in series and other parts connected in parallel within the same overall diagram, it isn’t purely series or purely parallel. It’s a mix of both, so it’s called a combination circuit (often referred to as a mixed circuit in some texts). That’s why combination circuit is the best label for a circuit that has both kinds of connections. For example, a resistor in series with a parallel group of resistors behaves as a combination: you treat the series portion and the parallel portion step by step to analyze the whole circuit.