Why do some power plugs have a big box at the end instead of a normal plug?

Question

Why do some power plugs, mainly older ones, have a big huge box plug at the end instead of a normal, small plug? Is there a reason for this, or no? I am just wondering as to why they are like that.

Answer 1

The 'big box' your talking about is an transformer. Many household appliance use DC voltage instead of AC. So the Transformer is used to convert the AC in your home to DC. Some appliances have the transformer built into the unit so they can use a standard plug instead of the big bulky one

Answer 2

maybe u are referring to an actual plug.
The bigger plugs are still sold. They are used for larger amperage and have screws to secure the line wire.
Hence they have to be bigger than something that is molded on in one piece.