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, ...

Plugs where one blade is wider than the other can be annoying, but they'll also keep you a lot safer. Here's why they're like that and how it works.

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 ...

close up of Type A plug prongs - Gabriel Lopez/Shutterstock 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 ...