Have you ever wondered what the holes in electrical prongs are for? Well, some knowledgeable experts have the answer. Type A and Type B electrical plugs are the two standard varieties used in the US.

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 ...

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 ...