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A meter under test is compared against a substandard meter or a wattmeter and stopwatch. The percentage error is computed as

  • A.the difference between the two disc speeds divided by the rated speed
  • B.the difference between registered and true energy divided by the true energy
  • C.the difference divided by the registered energy, expressed as a percentage
  • D.the ratio of the two readings expressed as a percentage of unity

Answer: B

Error is always referred to the true value, so the denominator is the energy actually supplied. A positive result means the meter registers more than the consumer has used, which is why the tolerance is specified in both directions.

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