Editing Poynting vector (section)

==Resistive dissipation==
If a conductor has significant resistance, then, near the surface of that conductor, the Poynting vector would be tilted toward and impinge upon the conductor.<ref name="Boule2024" />{{rp|at=figs.7,8}} Once the Poynting vector enters the conductor, it is bent to a direction that is almost perpendicular to the surface.<ref name="Harrington2001">{{cite book
| last = Harrington
| first = Roger F.
| year = 2001
| title = Time-Harmonic Electromagnetic Fields
| edition = 2nd
| publisher = McGraw-Hill
| isbn = 978-0-471-20806-8
| url = https://books.google.com/books?id=4-6kNAEACAAJ
|author-link=Roger F. Harrington
}}</ref>{{rp|p=61}} This is a consequence of [[Snell's law]] and the very slow speed of light inside a conductor. The definition and computation of the speed of light in a conductor can be given.<ref name="Hayt2011">{{cite book
| last = Hayt
| first = William
| title = Engineering Electromagnetics
| edition= 4th
| publisher = McGraw-Hill
| place = New York
| year = 2011
| isbn = 978-0-07-338066-7
| url = https://books.google.com/books?id=XeaHcgAACAAJ
}}</ref>{{rp|p=402}} Inside the conductor, the Poynting vector represents energy flow from the [[electromagnetic field]] into the wire, producing resistive [[Joule heating]] in the wire. For a derivation that starts with Snell's law see Reitz page 454.<ref name="Reitz2008">{{cite book
| last1 = Reitz
| first1 = John R.
| last2 = Milford
| first2 = Frederick J.
| last3 = Christy
| first3 = Robert W.
| title = Foundations of Electromagnetic Theory
| edition = 4th
| publisher = Addison-Wesley
| place = Boston
| year = 2008
| isbn = 978-0-321-58174-7
| url = https://books.google.com/books?id=PYYSplKkBOoC
}}</ref>{{rp|p=454}}