  ::Though you are correct in the widely employed usage of the term 'power factor', it is not correct in the strictly accurate definition.  The term 'power factor' is strictly defined as the cosine of the phase angle between sinusoidal voltage and sinusoidal current.  To cover the situation where the current waveform is not sinusoidal, the alternative term 'apparent power factor' was coined which addresses that it is not the proper fower factor and is defined as real power divided by apparent power (or Watts divided by Volt-Amps).  However, having said that, most engineers will just call it 'power factor' because it just happens to also be ratio of the real power to the apparent power - it's just not defined that way.  Many technical works, including those from highly authoratative sources, have abandoned the strictly correct former definition of 'power factor' for the latter in order to sweep the problem introduced by non sinusoidal currents firmly under the carpet.  The article here is no exception, but as the cited references support the point, this has to be regarded as acceptable.  I could cite references for the alternate definition, but they all predate the introduction of non sinusoidal power supplies as the problem had not yet arisen.  Addressing both concepts in the article would only serve to confuse the readership anyway.    