An open in a complex parallel circuit might cause current to:

• A. find a path to ground through another load, such as a bulb filament.
• B. increase current in the main branch.
• C. short to the power supply.
• D. open circuit stops all current.

Answer: (A)

In a parallel circuit, each load has its own current path between the same two points of the supply. If one path opens, that branch is removed, but the other branches still provide complete paths from the power source back to ground. So the current that would have gone through the opened branch instead continues through the remaining loads, effectively “finding” a path to ground through those other loads. The open branch doesn’t cause a short, nor does it cause all current to stop or the main branch current to automatically rise—the total current from the source simply decreases because one parallel path is gone.