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I The KE of an electron accelerated by an electric field

  1. Apr 26, 2017 #1
    Hello,

    An electron accelerated through a pd of V volts will have a K.E = eV. Why isn't the K.E less than this considering that some of the work done by the field has been radiated as electromagnetic waves by the accelerating electron ?

    All insights very welcome.
     
  2. jcsd
  3. Apr 27, 2017 #2
    The generator will do work in accelerating the electron, because a current is flowing, and must supply energy not only to KE but also to radiation and building a magnetic field. This means the electron takes longer for its journey than for KE only. Power is V x I but total energy is V x I x Time.
     
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