Charge (physics) | Wikipedia audio article
Channel: wikipedia tts
Date: 25/12/2018

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Charge_(physics)


00:00:44 1 Abstract definition
00:02:04 2 Examples
00:03:06 3 Charge conjugation
00:05:37 4 See also
00:09:37 5 References



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SUMMARY
=======
In physics, a charge may refer to one of many different quantities, such as the electric charge in electromagnetism or the color charge in quantum chromodynamics. Charges correspond to the time-invariant generators of a symmetry group, and specifically, to the generators that commute with the Hamiltonian.  Charges are often denoted by the letter Q, and so the invariance of the charge corresponds to the vanishing commutator 
  
    
      
        [
        Q
        ,
        H
        ]
        =
        0
      
    
    {\displaystyle [Q,H]=0}
  , where H is the Hamiltonian. Thus, charges are associated with conserved quantum numbers; these are the eigenvalues q of the generator Q.