A light bulb in a circuit near another circuit with a battery, a coil and a rheostat, can light up even though ITS OWN CIRCUIT HAS NO BATTERY. The phenomenon is called mutual inductance.

Licencia de Creative Commons Licencia Creative Commons Reconocimiento-No Comercial-Compartir Igual 3.0 España
logo INTEF Ministerio de Educación, Cultura y Deporte