If you've ever stared at the holes in an electrical plug and wondered why they exist, you're not alone. Like an industrial-age kōan, the answer is anything but straightforward. A quick search will ...

You find yourself in an airport or hotel room in another country, and you really need to charge your phone, camera or game system. But what is that strange-looking outlet? It has round holes! And ...

The US uses two standard electrical plug types: Plug Type A and Plug Type B. Both have two parallel pins for power, while the latter has an additional grounding pin for safety. But if you look closely ...

It can be really frustrating when you're hooking up an appliance or gadget with a three-prong plug only to realize the extension cord or outlet you're plugging it into only has two prongs. After all, ...