Reading Review

1- List five input devices and three output devices that might be attached to a PC. Describe a typical use for each.
INPUT
Keyboard-sends signals to computer through cables, enters text and numeric data
Mouse-used to point at specific characters and objects
Optical Mark Reader- use reflected light to determine location of pencil marks on standardized tests
Bar Code Readers- use light to read UPCs, inventory codes and other codes created from patterns of variable width bars.
Touch Screen- responds when user points to or touches different regions on screen

OUTPUT
Monitor- displays information in computer on a screen for user to view and interact with
Projector-shows information from monitor onto a large board or other surface to make it easier for large audiences to view
Printer- transfers the information to paper

2-Name and describe three special-purpose input devices people commonly use in public places, such as stores, banks, and libraries.
People use touch screens in grocery stores when using the self-checkout. Also used are bar code readers to scan the goods being purchased and Radio frequency identification readers use radio waves to communicate with RFID tags. THey are used to identify cars at toll booths, library books at checkout counters, and are in the antitheft cards attached to clothes in department stores.

3- Many people find that the mouse is impractical for use as a pointing device on a laptop computer. Describe at least three alternatives that are more appropriate.
Three alternatives to a mouse on a laptop are touchpads, pointing sticks and trackballs. Touchpad is a small flat panel sensitive to light pressure. To use it, the user moves their finger across this pad. Pointing stick is a small handle in the centoer of the keyboard that responds to finger presser by moving pointer in the direction it is pushed. The trackball is like an upside-down mouse. It is stationary while user moves a large ball to control cursor on screen.