Engineering · Electrical — Testing
A clamp-on (clamp) ammeter is used to measure the current in a conductor by:
- ABreaking the circuit and inserting the meter in series
- BSensing the magnetic field around the conductor without breaking the circuit✓ Correct
- CMeasuring the voltage drop across a fuse
- DReading insulation resistance
Explanation
A clamp meter encircles a single conductor and reads the magnetic field its current produces, letting you measure load current safely without opening the circuit.
Authority: Marine Electrical (USCG engineering topic)
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