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 ...

Ever been curious about the purpose of those tiny holes in electrical prongs? Some savvy tech heads have finally shed light on the mystery. Type A and Type B are the go-to electrical plugs in the US.

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 ...