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A clip-on or clamp ammeter is a current transformer whose

  • A.secondary is calibrated to read directly in amperes without a separate instrument
  • B.ratio is adjusted by clamping the jaws more or less tightly on the cable
  • C.primary consists of many turns wound round the cable being measured
  • D.core can be opened to admit the conductor

Answer: D

The split core lets the instrument be applied without breaking the circuit, which is its whole purpose. The joint in the magnetic path introduces reluctance and so a larger error than a solid core, which is the price of the convenience.

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