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A capacitor's dissipation factor is the ratio of

  • A.the energy stored to the energy dissipated in each cycle
  • B.the working voltage to the breakdown voltage of the dielectric
  • C.its equivalent series resistance to its reactance
  • D.its leakage resistance to its reactance at the working frequency

Answer: C

It is the tangent of the loss angle and expresses how far the capacitor departs from an ideal reactance. A good film capacitor manages a few parts in ten thousand, while an electrolytic may reach a few per cent, which matters greatly in a power supply.

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