Editing Inductor (section)

===Lenz's law===
{{Main|Lenz's Law}}
The polarity (direction) of the induced voltage is given by [[Lenz's law]], which states that the induced voltage will be such as to oppose the change in current.<ref name="Shamos">{{Cite book|url=https://books.google.com/books?id=J0fCAgAAQBAJ&q=1834+Lenz%E2%80%99s+Law&pg=PT238|title=Great Experiments in Physics: Firsthand Accounts from Galileo to Einstein|last=Shamos|first=Morris H.|date=2012-10-16|publisher=Courier Corporation|isbn=9780486139623|language=en}}</ref> For example, if the current through an inductor is increasing, the induced potential difference will be positive at the current's entrance point and negative at the exit point, tending to oppose the additional current.<ref name="Schmitt">{{cite book
 | last1  = Schmitt
 | first1 = Ron 
 | title  = Electromagnetics Explained: A Handbook for Wireless/ RF, EMC, and High-Speed Electronics
 | publisher = Elsevier
 | date   = 2002
 | pages  = 75–77
 | url    = https://books.google.com/books?id=7gJ4RocvEskC&q=%22lenz%27s+law%22+energy&pg=PA75
 | isbn   = 978-0080505237
 }}</ref><ref name="Jaffe">{{cite book
 | last1  = Jaffe
 | first1 = Robert L.
 | last2  = Taylor
 | first2 = Washington
 | title  = The Physics of Energy
 | publisher = Cambridge Univ. Press
 | date   = 2018
 | pages  = 51
 | url    = https://books.google.com/books?id=RMhJDwAAQBAJ&q=%22lenz%27s+law%22+energy+stored+inductor+current&pg=PA51
 | isbn   = 978-1108547895
 }}</ref><ref name="Lerner">{{cite book
 | last1  = Lerner
 | first1 = Lawrence S. 
 | title  = Physics for Scientists and Engineers, Vol. 2
 | publisher = Jones and Bartlet Learning
 | date   = 1997
 | pages  = 856
 | url    = https://books.google.com/books?id=Nv5GAyAdijoC&q=inductor+energy+%22magnetic+field%22+current&pg=PA856
 | isbn   = 978-0763704605
 }}</ref> The energy from the external circuit necessary to overcome this potential "hill" is being stored in the magnetic field of the inductor. If the current is decreasing, the induced voltage will be negative at the current's entrance point and positive at the exit point, tending to maintain the current. In this case energy from the magnetic field is being returned to the circuit.