Which of the following is a listed benefit of the amp clamp?

• A. Slow and inaccurate
• B. High cost
• C. Requires frequent calibration
• D. No current loss

Answer: (D)

The main idea here is measuring current without loading the circuit. An amp clamp works by encasing a single conductor in a magnetic core; as current flows, it creates a magnetic field that the sensor reads (transformer principle for AC or Hall effect for DC). Because the conductor isn’t broken or placed through a measuring element, the circuit’s current path isn’t altered, so there’s no additional resistance or burden—no current loss. That non-invasive measurement is the clear benefit. The other options describe drawbacks and aren’t advantages of using a clamp; they would imply changed, costly, or less accurate measurements, which isn’t what the amp clamp aims to provide.