How does the Oral-B toothbrush charge it's battery without making an electrical connection?
The prototype of Braun Oral-B toothbrush I have sits on the charging base, but both are completely sealed, and there is no electrical joint between the two. So what is the technology behind this type of charger?
Inductive coupling. There is a helix of wire at the base of the toothbrush inside the plastic charger stand and there is another loop inside the plastic base of the toothbrush itslf. When you pass an alternating electrical present-day through the coil








