Discussion
Which quantity does an ammeter clamp measure without breaking the circuit?
Answer: C
A clamp meter reads the field around a cable, which allows a starter current of hundreds of amps to be measured safely. Volt drop along a cable is a genuine alternative technique used with a known cable, which makes the second option a real method. Reading the definition literally, rather than recalling a summary, avoids the usual confusion. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision.
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