Which instrument is used to measure resistance in a circuit to test continuity?

• A. Lamp and Battery
• B. Bell and Battery
• C. Ohmmeter
• D. Receptacle Tester

Answer: (C)

Testing continuity is about whether a complete path for current exists. To tell that reliably, you need a tool that measures resistance directly. An ohmmeter does exactly that: it applies a small current and measures the resulting voltage to determine resistance, often giving a beep or a near-zero reading when the path is continuous. The other options are power-related tools: a lamp and battery or a bell and battery supply energy to a circuit but don’t measure resistance, so they don’t provide a true continuity test. A receptacle tester checks wiring configuration and outlet safety, not the actual resistance of a circuit path. So the instrument best suited for measuring resistance to test continuity is the ohmmeter.