Editing Transformer (section)

===Induction coils===
{{main|Induction coil}}
[[Image:Faradays transformer.png|thumb|right|Faraday's ring transformer]]
The first type of transformer to see wide use was the [[induction coil]], invented by Irish-Catholic Rev. [[Nicholas Callan]] of [[Maynooth College]], Ireland in 1836.<ref name="Guarnieri2013-56"/> He was one of the first researchers to realize the more turns the secondary winding has in relation to the primary winding, the larger the induced secondary EMF will be. Induction coils evolved from scientists' and inventors' efforts to get higher voltages from batteries. Since batteries produce [[direct current|direct current (DC)]] rather than AC, induction coils relied upon vibrating [[electrical contact]]s that regularly interrupted the current in the primary to create the flux changes necessary for induction. Between the 1830s and the 1870s, efforts to build better induction coils, mostly by trial and error, slowly revealed the basic principles of transformers.