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A shunt-type ohmmeter, in which the unknown is connected across the movement, is preferred for

  • A.low resistance ranges
  • B.high resistance ranges of the order of a few megohms and upward
  • C.measurements in which the polarity of the applied voltage must be reversible
  • D.use on alternating current, where a series ohmmeter cannot be employed at all

Answer: A

With the unknown in parallel with the movement a low resistance diverts most of the current and the pointer falls, so the scale opens out at the low end. The zero of such an instrument is at no deflection and the infinity mark at full deflection, the reverse of the series type.

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