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Which measurement confirms a coil is producing adequate output?

  • A.A visual inspection
  • B.The secondary resistance, which indicates whether the many turns of fine wire remain continuous within the coil
  • C.A spark across a calibrated test gap
  • D.The primary resistance, which indicates the condition of the winding and therefore the output of the coil

Answer: C

A calibrated gap tester shows whether the coil can produce the voltage needed under load. Resistance measurements genuinely find open and shorted windings, which makes both electrical options real tests that simply cannot reveal breakdown under voltage. Checking which component actually carries the load settles most questions of this kind at once. The order in which the effects act is what decides the outcome, so it is worth establishing first.

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