What instrument is used to measure continuity in an electrical circuit?

• A. Ohmmeter
• B. Voltmeter
• C. Ammeter
• D. Oscilloscope

Answer: (A)

Continuity means there’s a complete conducting path between two points. An ohmmeter is the instrument designed to measure resistance by passing a small test current through the circuit and reading how much resistance is present. When the path is continuous, the resistance is very low, indicating a closed circuit. If the path is broken, the resistance appears very high or infinite, indicating an open circuit. Many ohmmeters have a continuity beeper that sounds when the resistance is below a chosen threshold, making quick checks in wiring and connectors practical. Remember to test with power off so you’re measuring resistance, not trying to read a live circuit. Voltmeters, ammeters, and oscilloscopes measure voltage, current, or waveforms, not continuity directly, which is why the ohmmeter is the appropriate choice.