How do you identify a series versus parallel circuit in a schematic?

• A. In series, components share the same voltage across them
• B. In parallel, components share the same current path
• C. In parallel, components are connected across the same two nodes
• D. In series, components share the same current path

Answer: (D)

In a schematic, you identify series versus parallel by looking at how the components are connected and how current and voltage behave through them. In a series arrangement there is a single path for current to flow through all components, so the same current passes through every component in that loop. The voltage across the components adds up to the total supply voltage, with the split depending on each component’s resistance.

The statement that series components share the same current path captures this defining behavior: the current is the same through each component because there’s only one path for it to take.

The other ideas describe parallel behavior. In parallel, components are connected across the same two nodes, so the full supply voltage appears across each component. Currents in parallel branches split and sum to the total, rather than sharing one path. The notion that parallel components share the same current path is not correct, and the idea that series components share the same voltage is describing parallel behavior, not series.