Glossary E

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Electro frog

Is a Peco term for live (power) frog Turnout (Switch or Points),which some people call power-routing.
http://www.loystoys.com/peco/about-electrofrog.html
Wiring a Peco 3 way point

Electro magnet

A coil of wire in air or on a former that if current is passed through the wire a magnetic field will be produced
http://www.le.ac.uk/se/centres/sci/selfstudy/mam11.htm

ESR

Equivalent Series Resistance