text: can you tell a device that can explain the induction? i mean it must be a device whose working principle can be explained with induction and inductance. a good illustrative device could be the electricity meter you certainly have at home too. it's also referred to as 'electromechanical induction meter' or 'ferraris meter'.  http://en.wikipedia.org/wiki/electric_meter#means_of_operation  the invention of its principle is attributed to galileo ferraris:  http://en.wikipedia.org/wiki/galileo_ferraris  his prototype would have looked like this:  http://www.museodifisica.unito.it/schede/scheda00000010.html