Which circuit would have current not flow if there is an obstruction?

• A. Open Circuit
• B. Closed Circuit
• C. Parallel Circuit
• D. Series Circuit

Answer: (D)

In a series circuit there is only one path for current. If anything obstructs that path, the circuit becomes incomplete and current can’t flow at all. That single-path setup means a blockage stops the entire current flow.

In a parallel circuit there are multiple paths. If one path is obstructed, current can still travel through the other paths, so overall current doesn’t have to stop. An obstruction in a single path creates an open circuit in that path, but doesn’t necessarily end current flow in a parallel arrangement.

So the situation described—an obstruction causing no current flow—fits a series circuit because the single path means any blockage stops all current.