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The scale of a simple series ohmmeter is

  • A.uniform throughout, since the current is directly proportional to the resistance measured
  • B.non-uniform, with the infinity mark at the full deflection end of the scale
  • C.uniform over the upper half of its range and cramped only near the lower end
  • D.non-uniform, with zero at full deflection

Answer: D

The current is inversely proportional to the total resistance, so the divisions crowd together as the resistance rises. Zero ohms gives the largest current and therefore full deflection, while infinite resistance gives no current and the pointer stays at the mechanical zero of the movement.

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