A resistance measurement can determine if the circuit has an open.

• A. An open circuit
• B. A short circuit
• C. A ground fault
• D. A closed loop

Answer: (A)

A resistance measurement checks whether there is electrical continuity along a path. If the circuit has an open, the path is broken and current cannot flow, so the ohmmeter reads a very high or infinite resistance, signaling an open condition.

If the path were a short circuit, the reading would be very low because the unintended connection creates a nearly zero resistance. A closed loop means the path is complete and the reading is finite, showing that current can flow normally. A ground fault introduces an unwanted path to earth, which can complicate readings, but the essential idea for identifying an open is seeing an infinite or excessively high resistance.