Introduction to Computing Slides By ADEELA MUSTAFA

Input (5 th –Chapter) What Is Input Input is any data and instructions entered into the memory of a computer, people have a variety of options for entering data and instructions into a computer. Once data is in memory, the computer interprets and executes instructions to process the data into information. Instructions entered into the computer can be in the form of programs, commands, and user responses.

Input What Are Input Devices An input device is any hardware component that allows users to enter data and instructions (programs, commands, and user responses) into a computer. Depending on the application and your particular requirements, the input device selected.

Input The Keyboard A keyboard is an input device that contains keys users press to enter data and instructions into a computer Desktop computer keyboards typically have from 101 to 105 keys. All desktop computer keyboards have a typing area that includes the letters of the alphabet, numbers, punctuation marks, and other basic keys. Many desktop computer keyboards also have a numeric keypad on the right side of the keyboard. A keyboard also contains other keys that allow users to enter data and instructions into the computer. Keyboards with media control buttons allow you to control your media player program, access the computer’s optical disc drive, and adjust speaker volume. Internet control buttons allow you to open an program, start a Web browser, and search the Internet. Some keyboards have USB ports so that you can plug a USB device directly in the keyboard instead of in the system unit.

Input A wireless keyboard, or cordless keyboard, is a battery-powered device that transmits data to the system unit using wireless technology, such as radio waves (Bluetooth) or infrared light waves (IrDA).

Input Pointing Devices A pointing device is an input device that allows a user to control a pointer on the screen. In a graphical user interface, a pointer is a small symbol on the screen whose location and shape change as a user moves a pointing device. A pointing device can be used to move the insertion point; select text, graphics, and other objects; and click buttons, icons, links, and menu commands. Mouse A mouse is a pointing device that fits under the palm of your hand comfortably. The mouse is the most widely used pointing device on desktop computers With a mouse, users control the movement of the pointer, often called a mouse pointer in this case. As you move a mouse, the pointer on the screen also moves. Generally, you use the mouse to move the pointer on the screen to an object such as a

Input button, a menu, an icon, a link, or text. Then, you press a mouse button to perform a certain action associated with that object. Most desktop computer users today have some type of optical mouse, which uses devices that emit and sense light to detect the mouse’s movement. Some use optical sensors, and others use a laser, The latter, often referred to as a laser mouse. A newer type of mouse, called an air mouse, is a motion-sensing mouse that, in addition to the typical buttons, allows you to control objects, media players.

Input

Touch Screens and Touch-Sensitive Pads A touch screen is a touch-sensitive display device. Touch screens that recognize multiple points of contact at the same time are known as multi-touch Users can interact with touch screens by touching areas of the screen. Because touch screens require a lot of arm or hand movements, you do not enter large amounts of data using a touch screen. Some models of desktop computers and notebook computers, including netbooks and Tablet PCs, and many mobile devices have touch screens. A recently developed touch screen, called Microsoft Surface, is a 30-inch tabletop display that allows one or more people to interact with the screen using their fingers or hands.

Input Touch-Sensitive Pads Portable media players that do not have touch screens typically have a touch-sensitive pad, which is an input device that enables users to scroll through and play music, view pictures, watch videos or movies, adjust volume, and/or customize settings. Touch sensitive pads typically contain buttons and/or wheels that are operated with a thumb or finger. For example, users rotate a Click Wheel to browse through the portable media player’s song, picture, or movie lists and press the Click Wheel’s buttons to play or pause media, display a menu, and perform other actions.

End Thank You All (have a nice day)