Serena Keomalithong ITECH 1001-64
Chapter 2 Activity 2

1. Describe the different types of input and output devices. * Input devices include, keyboards and/or mouses. Keyboards contain 101-104 keys. You have to press the correct combination of keys to input data. Mouses are used with your personal computer. It rolls on a small ball or red scanner. When you roll the mouse across a flat surface to censor the mouse to move. * Output devices include, plotters and/or speakers. Plotters is a device similar to a printer, but usually allows you to print larger images that regular printers can’t. This is commonly used by designers and research sectors. Speakers can be sold separately from computers. Some monitors may have speakers built directly into the unit. Speakers enhance the value of educational and presentation products.
2. Discuss the difference between different types of input and output devices. * Input devices are any hardware that inputs data into your computer like keyboards, or webcams. Output devices are any hardware that displays output information like printers, or speakers.
3. Discuss the factors that affect the quality of various input and output devices. * Factors that affect the quality of input devices and output devices include the speed of the device. If you put a slow device into a more faster system, it will decrease the overall system speed.

Detailed Description:

Keyboards

I. Introduction to Keyboards * They are computer hardware input devices. * Used for controlling characters and sending special commands to the operating system. * Commonly used for text input. II. History of Keyboard * Invented during 1873. * Invented by Christopher Latham Scholes. * The first design layout was arranged in alphabetical order. III. Keyboards Layouts * QWERTY keyboards, which are commonly used. * AZERTY keyboards, which are known to help users type even faster. IV. Advantages of Keyboards * They have special keys that perform specific functions. * Instead of using mouses to move the cursor, you can use the arrow key on the keyboard to move the cursor, on laptops only. * Keyboards are less expensive because they usually come with a purchase of most computers. V. Disadvantages of Keyboards * People using keyboards must learn how to type. * When the keyboard spoils, the computer becomes almost hard to use. * The frequent movement for keyboards to move and back could cause carpal tunnel syndrome, which occurs in your hands.