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Impact of external energy in first principle?

  1. Aug 1, 2017 #1
    The thermodynamic generally uses this form for first principle: dE=dW+dQ where E is internal energy. Lot of laws, for example in the second principle scope (properties of entropy) are using this form. What impact if external energy is taken into account? so dEe+dEi=dW+dQ.
    Of course, during next hours, i will develop what happens on entropy, based on Planck's point of view, but i'm curious to know ideas you could have...
  2. jcsd
  3. Aug 1, 2017 #2
    Welcome to PF!
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