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Comparing the energy stored and the energy transported in a length of transmission line carrying power to a load, both are described by

  • A.Poynting's theorem, which relates them term by term
  • B.Gauss's law applied to the conductors
  • C.Ampere's law applied to a loop round the line
  • D.the continuity equation for charge

Answer: A

The theorem's three terms are exactly the power crossing the boundary, the rate of change of the stored energy and the dissipation, so a line delivering steady power has the first balanced against the third with the second zero. It is the complete energy account for the line.

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