how do wireless chargers work?

Question

Charged my smartphone on a wireless charger and I’m convinced it is black magic or witchcraft. It barely charged (sitting for 4 hours, only went up by 10%.) I assume it has something to do with electrons…

In: 41

Answer 1

So it turns out that a changing magnetic field creates a voltage… and also electricity running through a wire creates a magnetic field. So, all you need to charge your device is to create a changing magnetic field, which is easy because you can do that by changing the current you run through the wires in your wireless charger.