introduction

There are lots of different ways that electronic devices can connect to one another. For example:
• Many desktop computer systems have a CPU unit connected to a mouse, a keyboard, a printer and so on.
• A personal digital assistant (PDA) will normally connect to the computer with a cable and a docking cradle.
• A TV will normally connect to a VCR and a cable box, with a remote control for all three components.
• A cordless phone connects to its base unit with radio waves, and it may have a headset that connects to the phone with a wire.
• In a stereo system, a CD player and other audio devices connect to the receiver, which connects to the speakers.