Innamorati
A electrotechnical rolling up in is an electric driver isolated wound (rolled up around a support). This rolling up can not be made up as of only one whorl (turn of the support), like as well of thousands of whorls.
Rollings up are in general intended for the electromagnetic applications of electrical engineering (electromagnet, Electric transformer, coil).
One often names rollings up winds S and this since the beginnings of electricity.