Technology
Why electric toothbrushes have no exposed charging contacts
HERE’S THE INTERESTING PART
Plugging an exposed metal cable into a device covered in dripping wet toothpaste is a spectacularly bad idea. To avoid electrocuting you, the charger creates an alternating magnetic field that transfers energy right through the solid plastic casing. It wastes a ton of electricity just so you can safely drop it into a puddle of water.
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