What is an Adapter and Why are they Important?
External power adapters, also known as power supplies, are crucial to the operation of virtually all small electronic devices. As many as 1.5 billion are in use in the U.S. — that's about five for every person. The total electricity flowing through all types of power supplies is about:
- 300 billion kWh/year, and
- 11% of the national electric bill
They convert high voltage ac electricity from the wall outlet to the low voltage dc power used to power electronic products, like MP3 players, Personal Digital Assistants (PDAs), camcorders, digital cameras, laptops, and cordless and mobile phones.