1) As you know, inserting a bar magnet into a solenoid produces an electric current in that solenoid. The cause of such current was named EMF. (which is the difference of potential, in Volts, not a force in Newtons).
2) Consider a simple circuit -- a battery, a switch, and a solenoid, connected in series. There is no magnet nearby. Suppose the switch is turned on suddenly. The current starts growing (but not as quickly as it would, if the solenoid were replaced by an ohmic resistor, of the same R as the solenoid). This slowing down of the current is said to be due to the rising EMF Back EMF/ Lenz Law. 3) The Back EMF is said to be due due to rising electric current. The polarity of such EMF is always opposite to the polarity of the battery. That is why the word "Back" is used. Ludwik ================================================= On Feb 7, 2016, at 3:34 PM, esa ruoho wrote: > So uhh noone has anything to say about this? > > --- > | Esa Ruoho | +358403703659 | http://fi.linkedin.com/in/esaruoho | > | http://lackluster.bandcamp.com | http://lackluster.org | > http://esaruoho.tumblr.com | > | http://twitter.com/esaruoho | http://facebook.com/LacklusterOfficial | > >> On 04 Feb 2016, at 23:59, Esa Ruoho <[email protected]> wrote: >> >> Hi, I'm putting this out here, hoping for some sort of layman's explanation >> of these two things. >> >> 1- What is Back EMF / Lenz Law? >> 2- What would happen if a Motor-generator could be built that was immune to >> BackEMF/Lenz Law/ (sometimes referred to as Back Torque)? >> >> >> >> -- >> --- >> http://twitter.com/esaruoho // http://lackluster.bandcamp.com // >> +358403703659 // >> skype:esajuhaniruoho // http://esaruoho.tumblr.com/ // iMessage: >> [email protected] // >
