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Comparing the burden of an ammeter with that of the leads in a five ampere secondary circuit of twenty metres, the leads

  • A.impose no burden at all
  • B.may well impose the larger burden of the two
  • C.impose a negligible burden compared with any instrument
  • D.impose exactly the same burden as the instrument in every case

Answer: B

Twenty metres out and back of two and a half square millimetre cable is around a third of an ohm, which at five amperes is more than eight volt-amperes, comparable with or larger than the ammeter itself. Lead burden is routinely the dominant term.

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