Difference between revisions of "Digital-Divide/D0/Getting-to-know-computers/English-timed"
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Revision as of 13:11, 9 July 2014
| Time | Narration |
| 00:01 | Welcome to the Spoken Tutorial on Getting to know Computers |
| 00:06 | In this tutorial we will learn about |
| 00:09 | the various components of a computer. |
| 00:11 | We will also learn to connect the various components.
|
| 00:15 | Generally, there are 2 types of computers - |
| 00:18 | Desktop or Personal Computer and Laptop
|
| 00:23 | Now-a-days, tablet PCs or tabs for short, are also quite popular. |
| 00:31 | Functions of a computer. |
| 00:33 | A computer performs five major functions irrespective of its size -
|
| 00:40 | it accepts data or instructions by way of input |
| 00:45 | it processes data as required by the user |
| 00:50 | it stores data |
| 00:52 | it gives results in the form of output |
| 00:56 | it controls all operations inside the computer |
| 01:01 | Basic organisation of a computer is as shown in this block diagram. |
| 01:08 | Input unit |
| 01:09 | Central Processing unit |
| 01:11 | ' Output unit |
| 01:14 | The Input unit helps to |
| 01:16 | enter the data and programs into a computer system in an organised manner
|
| 01:23 | Keyboard, mouse, camera and scanner are some of the input devices. |
| 01:31 | The Central Processing unit |
| 01:33 | performs operations like arithmetic and logical operations and |
| 01:38 | stores data and instructions |
| 01:41 | Typically, the Central Processing unit or CPU looks like this. |
| 01:48 | It has many ports in the front and at the back of the unit.
|
| 01:53 | We will learn about them in a little while.
|
| 01:57 | It takes data and instructions, processes them and gives the output or results. |
| 02:05 | The task of performing operations is called processing.
|
| 02:11 | The output is then stored along with the data and instructions in the storage unit.
|
| 02:18 | The unit that supports the process of producing results from the data, is the output unit. |
| 02:26 | Monitor and printer are some of the output devices.
|
| 02:33 | Generally, a desktop computer has 4 main components |
| 02:38 | Monitor |
| 02:39 | CPU |
| 02:40 | Keyboard |
| 02:41 | and Mouse |
| 02:43 | A camera, printer or scanner can also be connected to a computer. |
| 02:50 | This is a monitor or the computer screen, as we call it. |
| 02:55 | It looks like a TV screen. |
| 02:57 | It is the visual display unit of a computer. |
| 03:02 | It displays the computer's user interface. |
| 03:05 | *One can open various programs and interact with the computer, using the keyboard and mouse. |
| 03:13 | The keyboard is designed to enter text, characters and other commands into a computer. |
| 03:21 | This is the computer mouse. |
| 03:24 | Typically, it has 2 clickable buttons and a scroll button in between.
|
| 03:31 | Pressing the left mouse button, activates most actions. |
| 03:35 | Pressing the right mouse button, activates more non-standard actions like shortcuts. |
| 03:43 | The mouse wheel is used to scroll up and down, by rolling the scroll button. |
| 03:49 | The computer mouse is an alternative way to interact with the computer, besides the keyboard. |
| 03:57 | Now, let us see the various parts of the CPU. |
| 04:02 | There is a prominent button on the front of the CPU which is the POWER ON switch. |
| 04:08 | To turn on the computer, one needs to press this switch. |
| 04:14 | There is a reset button, too, which helps us to restart the computer, if required. |
| 04:21 | Also, on the front side, you will notice 2 or more USB ports and a DVD/CD-ROM reader-writer. |
| 04:30 | The USB ports are used to connect pen-drives to the computer. |
| 04:35 | And the DVD/CD-ROM reader-writer is used to read or write a CD or a DVD. |
| 04:43 | Now let's look at the back of the computer. |
| 04:48 | The ports at the back, are used for connecting the CPU to the other devices of the computer. |
| 04:55 | This is done using cables. |
| 04:58 | There are many components inside the CPU. |
| 05:02 | When the computer is on, all these components work and generate heat. |
| 05:08 | Fans at the back provide the air flow required to cool the components. |
| 05:14 | Otherwise, overheating can cause damage to the CPU, often leading to data loss.
|
| 05:21 | This is the case cooling fan. |
| 05:23 | It keeps the temperature of the CPU normal and prevents overheating.
|
| 05:30 | Power Supply Unit, also called PSU, supplies power to the computer. |
| 05:37 | Now, let's learn how to connect the various components to the CPU. |
| 05:42 | Place all the components on the table, as shown. |
| 05:46 | Place all the cables on the table, as shown. |
| 05:51 | First, let's connect the monitor to the CPU. |
| 05:55 | Connect the power cable to the monitor, as shown. |
| 06:00 | Now, connect the other end to a power supply socket. |
| 06:04 | This is the power cable of the CPU. |
| 06:08 | Connect it to the CPU, as shown. |
| 06:11 | Then, connect it to a power supply socket |
| 06:14 | Next, connect the keyboard cable to the CPU, as shown. |
| 06:19 | The port for the keyboard is usually “purple” in colour. |
| 06:23 | You can connect the mouse to the port which is “green” in colour. |
| 06:28 | Alternately, you can connect the USB keyboard and mouse to any of the USB ports. |
| 06:35 | The remaining USB ports can be used for connecting pen drive, hard disk etc. |
| 06:42 | This is a LAN cable. |
| 06:44 | And this is a LAN port. |
| 06:46 | It is a wired connection that allows a computer to connect to a network. |
| 06:52 | The other end of the LAN cable is connected to a modem or a wi-fi router. |
| 06:58 | You will learn about configuring wi-fi connections in another tutorial. |
| 07:03 | The LED light will blink, when the LAN port is active and receiving activity. |
| 07:10 | You may notice that there are other serial ports on the CPU. |
| 07:15 | These are used for connecting PDAs, modem or other serial devices. |
| 07:21 | You will also notice that there are some parallel ports on the CPU. |
| 07:25 | These are used for connecting devices like printer, scanner etc. |
| 07:31 | Now, let's look at the audio jacks. |
| 07:34 | The port in “pink” is used for connecting a microphone. |
| 07:38 | The port in “blue” is for connecting a line in, for eg- from a radio or tape player. |
| 07:45 | The port in “green” is for connecting headphone/speaker or line out. |
| 07:51 | Now that we have connected all our devices, let's turn on the computer. |
| 07:57 | First of all, switch on the power supply buttons of the monitor and the CPU. |
| 08:03 | Now, press the POWER ON button on the monitor. |
| 08:07 | And then press the POWER ON switch, on the front of the CPU.
|
| 08:12 | Usually, you will see a string of words on a black screen, when your computer first turns on. |
| 08:18 | This is the BIOS system displaying information about |
| 08:22 | the computer's central processing unit, |
| 08:25 | information about how much memory the computer has, |
| 08:28 | and information about the hard disk drives and floppy disk drives. |
| 08:33 | BIOS is the software which gives the CPU its first instructions, when the computer is turned on. |
| 08:41 | The whole process of loading the operating system is called booting the computer. |
| 08:48 | When all the necessary checks are done, you will see the operating system's interface. |
| 08:54 | If you are an Ubuntu Linux user, you will see this screen. |
| 08:58 | And If you are a Windows user, you will see this screen. |
| 09:02 | Now, let us briefly look at a laptop. |
| 09:06 | Laptops are portable and compact computers. |
| 09:09 | A laptop is small and light enough to sit on a person's lap, while in use. |
| 09:16 | Hence, it is called a 'laptop.
|
| 09:18 | It has most of the same components as a desktop computer including |
| 09:23 | a display, |
| 09:24 | a keyboard, |
| 09:25 | a touchpad, which is the pointing and navigating device |
| 09:29 | a CD/DVD reader-writer and |
| 09:32 | mic and speakers built into a single unit.
|
| 09:36 | It also has a lan port and USB ports. |
| 09:40 | There is a video port, using which one can connect a projector to the laptop. |
| 09:46 | The audio jacks are easily identifiable, with respective icons for mic and headphones. |
| 09:53 | This is the inbuilt cooling fan in the laptop. |
| 09:57 | This helps to keep the laptop from overheating.
|
| 10:01 | A laptop is powered by electricity via an AC adapter and has a rechargeable battery. |
| 10:09 | Hence, it is portable and can be used away from a power source.
|
| 10:16 | Let us summarize. In this tutorial we have learnt |
| 10:20 | about the various components of a desktop and laptop |
| 10:23 | and how to connect the various components of a desktop
|
| 10:28 | Watch the video available at the following link |
| 10:31 | It summaries the Spoken Tutorial project |
| 10:34 | If you do not have a good bandwidth you can download and watch it |
| 10:37 | The Spoken Tutorial project team conducts workshops using spoken tutorials. |
| 10:42 | Gives certificates for those who pass an online test. |
| 10:46 | For more details, please write to: contact@spoken-tutorial.org |
| 10:52 | Spoken Tutorial Project is a part of the Talk to a Teacher project. |
| 10:56 | Supported by the National Mission on Education through ICT, MHRD, Government of India. |
| 11:01 | More information on this mission is available at the following link |
| 11:06 | The animation and 3D modeling for this tutorial is done by Arthi |
| 11:11 | This is Nancy Varkey from the spoken tutorial project IIT Bombay signing off. |
| 11:16 | Thanks for joining. |
Contributors and Content Editors
Gaurav, Kavita salve, PoojaMoolya, Pratik kamble, Sandhya.np14
