Q. How does a mobile adaptor work?

Electromagnetic induction is used by inductive battery adaptors to charge batteries. Through inductive coupling electromagnetic energy is transferred from a charging station to an electrical device. Unlike conventional mobile adaptors this one doesn't rely on making physical contact with the battery. The basic theory behind how a phone adaptor transforms AC electricity into DC is really straightforward (direct current). A step-by-step process is required to generate a 5V output which is what a smartphone requires. It requires a voltage input in order to generate a 5V output. A battery charged with an inductive adaptor does so via electromagnetic induction.