research Question

Defining EMF

Avatar of sidwelle
sidwelleFlag for United States of America asked on
Miscellaneous* Electronics* electrical engineering
4 Comments1 Solution15 ViewsLast Modified:
Trying to help some students understand EMF and I think they are confused by what the text -book that they are using stated:
"If a conductor, such as a copper wire, crosses the lines of force, the outer electrons in the atoms in the wire are freed and begin to move from atom to atom. This movement of the electrons results in an excess of electrons on one end of the conductor and a deficiency of electrons on the other.  This difference in charge is what we will later describe as voltage, or electrical potential.  It is this electrical potential that causes electric current to flow."

  • This is confusing and leads the reader to believe that electrons move before an EMF is produced.
  • a better description posted on Wikipedia: "An emf is induced in a coil or conductor whenever there is change in the flux linkages"  This is a better description as it tells the reader that the change in flux produces an EMF that has the ability to cause current to flow in the wire.

Is the first definition bogus ?  or does it follow what the current understanding of EMF ?


Join our community to see this answer!
Unlock 1 Answer and 4 Comments.
Start Free Trial
Learn from the best

Network and collaborate with thousands of CTOs, CISOs, and IT Pros rooting for you and your success.

Andrew Hancock - VMware vExpert
See if this solution works for you by signing up for a 7 day free trial.
Unlock 1 Answer and 4 Comments.
Try for 7 days

”The time we save is the biggest benefit of E-E to our team. What could take multiple guys 2 hours or more each to find is accessed in around 15 minutes on Experts Exchange.

-Mike Kapnisakis, Warner Bros