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True or false: an energy meter is an indicating instrument.

  • A.True, the pointers of the register being read exactly as those of an ammeter are
  • B.False, an energy meter accumulates rather than indicates
  • C.True, since its register indicates the energy consumed up to the present moment
  • D.True, because the disc speed indicates the power being taken at any instant

Answer: B

Indicating instruments show the present value of a quantity; an energy meter accumulates it over time, which makes it an integrating instrument. The distinction matters because an integrating instrument is tested over an interval and not at an instant.

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