CLASS - VII | CHAPTER - 1 (More Peripherals)

 SUBJECT: COMPUTER

CHAPTER-1 

More Peripherals

About Peripheral Devices

A peripheral device is any device attached to a computer in order to enhance its capabilities.

Devices	Explain	Photos
Biometric Devices	Biometric refers to the identity verification of living persons based on their physical characteristics like the characteristics of their fingers, hands, feet, face, eyes, ears, etc.
Optical Mark reader (OMR)	OMR detects the presence or absence of a mark in a specific position. Generally marks are made in specific boxes using a pencil, ballpoint pen, etc.
Magnetic Ink Character Reader (MICR)	MICR machine reads the special characters printed (like on a cheque) in a standard font using an ink containing iron oxide.
Magnetic Stripe Card/Reader	To read data from smart card, the card is swiped through a magnetic card unit, which converts the information into computer readable characters for further processing. ATM Card, Credit card etc. are some of these type of cards.
Smart Card/Reader	Smart cards are intelligent cards which inbuilt electronics and memory storage (RAM chip).  Lots of data like name, address, blood group type, etc. can be stored and updated on the RAM chip.
Liquid Crystal Display (LCD) projectors	LCD projectors are used when output is required on a big screen. Instead of on a monitor, the output is projected on the big white screen through the LCD projector.
Voice Recognition System	The Voice recognition system allows a user to use his/her voice as input.

Front of the System Unit

A port is an interface that allows you to connected a peripheral device (Mouse, keyboard, Printer, speakers and so on) to the computer

• The Power button is used to power the computer ON and OFF.

• The CD drive / DVD drive button can be pressed to make the CD/DVD tray slide in and out.

• Front USB ports allow you to connect USB drives and other devices with the USB ports to the computer, easily.

• Some computers have audio ports in the front that allow us to connect speakers, headphones and microphone easily to the computer.

Back of the System Unit

At the back of the computer’s system unit we find many different types of ports that allow us to connect variety of device to the computer.

• The Power Socket is where you will connect the power cable to the computer.

• Audio Ports (Audio in / Audio Out) help you to connect audio device like microphone, speakers, headphones and so on to the computer.

• An Ethernet cable is plugged into the Ethernet Port to connect the computer to a network or to the Internet.

• PS/2 ports are generally used for connecting a mouse and keyboard to the computer.

• Most of the USB ports in a computer are situated on the back side of the system unit. You can use these devices to connect a pen drive, USB mouse or keyboard and other USB devices.

• The monitor is connected to the system unit through the Monitor port. A power cable connects the monitor to the power supply as well.

• A printed is connected to the computer’s system unit through the Parallel port or the printer port.

Inside the System Unit

Power Supply Unit- The Power Supply Unit, also known as the Switched Mode Power Supply (SMPS) unit, converts power coming from a wall socket into a form that is needed by the computer. It supplies the power to the motherboard and other components through wires.

Motherboard- The main circuit board of the computer that lies inside the system unit is known as the motherboard. All critical components of the computer system including the CPU and memory (RAM and ROM) are either fixed or printed on the motherboard.

Central Processing Unit (CPU)- The Central processing Unit (CPU) or the processor is the ‘brain’ of a computer. In PCs, it is contained on a single integrated circuit or chip known as a microprocessor.

All the real processing work inside a computer is done by the CPU, with the help of its two main parts- the Control Unit ( CU ) and the Arithmetic Logic Unit ( ALU).

1. Control Unit (CU ) Controls the flow of binary data / information in the computer.

2. Arithmetic Logic Unit (ALU) performs the actual mathematical and logical computations on data process it.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         

Read Only Memory (ROM) -The ROM BIOS chip contains instruction to boot up the computer.

Random Access Memory (RAM)- The RAM is the memory that the computer uses to process data and run programs.

Hard Drive

The Hard disk drive connects to the motherboard through a connector cable. It is the main storage device of the computer and store all the programs installed on the computer as well as the work that we do on the computer.

Worksheets

Worksheet 1  Fill in the blanks with the help of the Help BOX.

Hardware USB Port Software Parallel Port Motherboard       ROM

1. The ________________ port is also known as the Printer port.

2. The ________________ chip contains instruction to boot up a computer.

3. The ________________ is known as the main circuit board of a computer.

4. To connect a pen drive into the computer you should insert it into the ________________.

5. A ________________ is an interface that allows you to connect a peripheral device to the computer.

6. Printer, monitor, CPU and keyboard are examples of computer ________________.

7. Programs installed on the computer are called ________________.

Worksheet 2  Tick the correct answer.

1. Which of these is a temporary memory ?

1. RAM b.  ROM c.  Hard disk

2. Where do you connect a monitor?

1. PS/2 b.  Parallel port c.  Monitor port

3. Which do you connect a monitor?

1. Keyboard b.  Mouse c.  Pen drive

4. Which of these is not a port?

1. PHP b. PS/2 c. USB

5. Which of these is not a software?

1. Adobe flash b. Plotter c.  MS Excel

Worksheet 3  Write ‘T’ for True and ‘F’ for False statements.

1. The printer can be connected to a computer only through the serial port.

2. The Ethernet port allows you to connect a networking cable to the computer.

3. MS Word and MS Excel are examples of computer hardware.

4. The Microphone should be connected to the audio in port as its job is to input sound into the computer.

5. Most of the USB ports in a computer are situated on the front side.

Worksheet 4 Answer the following questions

1. What is a motherboard?

2. What are the two main parts of the CPU?

3. Distinguish between the USB and PS/2 ports.

4. What is RAM?

5. Describe any three ports that you will find on the back side of the system unit.