Is it there for aesthetic value or something more? If you live in the U.S., you're familiar with the holes in the prongs of electrical plugs. Many, if not most, American plugs have them. So what ...

Not all outlet holes are the same, and there's a reason for that. The shapes (vertical slots, round holes, T-slots, etc.) correspond to specific electrical functions and safety features. Take the ...

In 1904, back when Thomas Edison was alive and Tesla was just his rival's last name, Harvey Hubbell patented the electric plug. Before that, electrical connections were hardwired. Hubbell's plug was ...

We use plugs every day, but most of us don't spend a lot of time thinking about them. We know that there are various electrical plug types, even if we're not familiar with the ins and outs of all of ...