00:00Working off a computer
00:13Lofty goal
00:16In this lesson you will learn about the various input-output devices of computers.
00:24Hey Mindy, do you remember what an IPO cycle is?
00:30Yes, it is how a computer works, takes input, does processing and produces output.
00:37Let us begin with an example.
00:40Do you know how a sandwich is made?
00:44Step 1.
00:45Input.
00:46Collect bread slices and butter.
00:49Step 2.
00:50Process.
00:50Apply butter on one side of bread slices.
00:54Step 3.
00:55Output.
00:56Buttered sandwich is ready to eat.
01:00Similarly, a computer works through these three simple steps.
01:06This process is called the IPO cycle.
01:09That is, input, process, output.
01:14Input.
01:15Whatever goes into the computer is called the input.
01:18We use the following main devices to input data.
01:21Mouse, keyboard, scanner, joystick, microphone.
01:28Some more.
01:30Data refers to a collection of numbers, characters, images or information.
01:37Mouse.
01:38Mouse is an input device.
01:41It is used to give commands to the computer.
01:43It inputs data in many ways.
01:45A single click selects an item.
01:50Double-clicking an item opens a program.
01:53You can drag an icon by moving the mouse with the left button pressed.
02:00Releasing the button drops the icon being dragged.
02:03You can draw a picture by pressing its buttons.
02:10Hey, Mighty!
02:12The keys on the keyboard are not in alphabetical order.
02:16Oh, yes!
02:17The arrangement of keys is based on QWERTY, which makes typing easier.
02:24Keyboard.
02:25Keyboard is an important input device.
02:28It is used to enter data and commands into the computer.
02:32The different types of keys on the keyboard are
02:44Alphabet keys
02:46From A to Z
02:48Number keys
02:49From 0 to 9
02:51Function keys
02:53From F1 to F12
02:55Functuation keys
02:57Special keys
02:59Shift
03:00Control
03:01Alt
03:03Delete
03:04Ints
03:05PG Up
03:07PG Down
03:08Arrow keys
03:11Invention
03:14The QWERTY keyboard was invented by Christopher Scholz, who also invented the typewriter.
03:24Scanner
03:25Scanner
03:26Scanner is a kind of input device that reads text and images printed on paper and saves the information in the computer in the form of an image.
03:36Scanners are of two types.
03:39Flatbed or simple scanner
03:42Handheld scanner
03:44Hotz
03:46Why is a handheld scanner used in shops?
03:53Joystick
03:54A joystick is also an input device.
03:58It is used to move the cursor position on the screen.
04:01Its function is similar to a mouse.
04:05It is a stick which has a ball at its lower end.
04:09It uses a lever to control the position of the cursor by rolling this ball.
04:15Joysticks are used for playing computer games.
04:20Microphone
04:21A microphone is an input device that allows you to record sound into the computer.
04:29Processing
04:30Input data is processed in the CPU, central processing unit.
04:36CPU is the most important part of a computer.
04:39It does all the processing and decision making in the computer.
04:43It also controls all the other parts of the computer system.
04:47The CPU can be found inside the CPU box.
04:51The CPU consists of three units.
04:57Output
04:58Output is the result which the computer produces after processing the input data in the CPU.
05:05Following are the main output devices.
05:08Monitor
05:09Printer
05:10Speaker
05:11Headphone
05:12Monitor
05:15When you type anything, you can see it on the monitor screen.
05:20Monitors are available in various shapes and sizes.
05:24Two types of monitors are displayed below.
05:29Crt
05:29Cathode Ray Tube
05:31Monitor
05:32LCD
05:33Liquid Crystal Diode
05:36Monitor
05:37Printer
05:40A printer produces output on paper.
05:43You can print texts and pictures using a printer.
05:48A printer can print in black and white as well as in color.
05:51There are mainly three types of printers.
05:55Dot matrix printer, inkjet printer, laser printer.
06:01Some more.
06:03Inkjet printers are best for photo printing because of their high picture quality.
06:08Speaker
06:10Speaker
06:10There are usually two speakers attached to a computer.
06:15These are used to listen to music and all sound output.
06:20They come in various sizes and shapes.
06:24Headphone
06:25A headphone is a device used for listening to music or sound coming from a computer.
06:31A headphone is used personally where only one person uses it at a time.
06:42Which one is correct?
06:43A headphone
06:44A headphone
06:46A headphone
06:48B
06:48B
06:48S
