BBC
Bbc: Gcse Bitesize: Input Devices, Processing and Output Devices
Review the definitions and images of computer input and output devices. You can quiz yourself on page three by taking the Test Bite.
Khan Academy
Khan Academy: Input & Output Devices
Become familiar with the parts of the computer that we interact with daily: the input and output devices.
Khan Academy
Khan Academy: Input & Output Devices
Computer input and output devices are examined in this article.
ABCya
Ab Cya: Computer Input & Output Devices
Children use different computer devices every day. Some devices are used to input information, while others are to output information from our computers. We will learn about 3D printers, scanners, projectors and more!
Khan Academy
Khan Academy: What Are the Parts of a Computer?
Each computer receives input from a variety of devices, processes that data with the CPU and memory, and sends results to some form of output. This diagram visualizes that flow.
Other
University of Arkansas: Simple Machines
A thorough discussion of all the simple machines, beginning with some thoughts on mechanical advantage and conservation of energy. Very complete. Move down to the section that interests you.