circuit

A closed loop with elements in series and in parallel. Series means everything shares one path, so the weakest element sets the limit for the whole loop. Parallel means there is a second route, so one element failing does not stop the rest. Switches mark where the loop can be opened. Borrowed from electronics, and it earns its place whenever a system has one shared path and you need to find the element throttling it.

A closed loop with elements in series and in parallel. Series means everything shares one path, so the weakest element sets the limit for the whole loop. Parallel means there is a second route, so one element failing does not stop the rest. Switches mark where the loop can be opened. Borrowed from electronics, and it earns its place whenever a system has one shared path and you need to find the element throttling it.

Example

Best when one shared path is limiting everything downstream and you want to find which element is doing it.