JSS1 CRS Lesson Note (Third Term) 2025

The lesson note for JSS1 ICT Third term is now available for Tutors, parents, guardians and students who have been searching for an accurate and updated 2025 note.

Please note that the Third term lesson note is curled out from the approved scheme of work for Junior secondary school. So you can do your verification as well and compare the Third term lesson note for JSS1 ICT as seen on the free PDF file made available towards the end of this post.

The JSS1 ICT lesson note for Third term is in line with the 2025 JSS1 ICT scheme of work for the term. This means the JSS1 ICT lesson note is tailored towards achieving the aim and objective for the subject as mandated by the ministry of education.

JSS1 ICT Third Term Lesson Note 2025

JSS1 THIRD TERM ICT E-NOTE

• REVISION OF LAST TERM’S WORK
• IMPORTANT TOOL FOR PROCESSING DATA
• THE DEVICE
• TYPES AND USES OF COMPUTER
• FUNDAMENTAL COMPUTER OPERATION
• INTERNAL FEATURES OF THE SYSTEM UNIT
• SCREEN POINTING DEVICES
• MASTERY OF THE KEYBOARD

Week 2

Topic: Important Tool for Processing Data

Data are raw fact given to the system to process in order to obtain information. Data are referred to as unprocessed information

Information is the result to obtain from a processed data. Information is referred to as PROCESSED DATA. Although data and information are used interchangeable but there are still differences.

Data are input into the computer system while information is displayed or painted out of the computer system.

However, many tools such as finger, abacus, and Napier logarithms e.t.c can be used to process data into information computer system is the best of all these tools because of the following reasons

1. Accuracy:Computer has high degree of accuracy. Therefore any data processed with computer system is being processed with high degree of accuracy.
2. Reality: Computers are the most reliable machine that has ever. Exist in human history therefore any information obtained from computer processed data is highly reliable.
3. Fastest Machine:computers perform operation in micro seconds. There data processed using computer system is done at a very fast rate which other machine cannot.
4. Easy to Operate:Computer requires little energy for operation on like other machine.
5. Efficiency: Although the efficient of machine can never be 100% percent, but computer has as much as 99.9% percent efficient.

Assessment

1. Mention 3 examples of data processing tools
2. What are the reasons for using these tools?
3. What is the accepted percentage for a computer’s efficiency?

Week 3

Topic: The Device

A device is any machine or tools used for a particular purpose. It is a tool used to perform a specific function.

It is an object, machine, or piece of equipment that has been made for some special purpose. In the context of computer technology, a device is a unit of hardware , outside or inside the case or housing for the essential computer (processor, memory, and data paths) that is capable of providing input to the essential computer or of receiving output or of both. When the term is used generally (as in computer devices ), it can include keyboards, mouses, display monitors, hard disk drives, CD-ROM players, printers, audio speakers and microphones, and other hardware units. Some devices such as a hard disk drive or a CD-ROM drive, while physically inside the computer housing, are considered devices because they are separately installable and replaceable. With notebook and smaller computers, devices tend to be more physically integrated with the “non-device” part of the computer.

Classes of Device

Devices can be classified into any of following

1. Early Counting Device: Early counting devices are devices that were used by man for counting during the primitive era. E.g. finger, stone, marbles. e.t.c
2. Mechanical Devices: Mechanical devices are devices that were used to perform mechanical function before the invention of the more sophisticated computer system. E.g. abacus. Slide rule e.t.c they perform the function without making use of electricity.
3. Electronic Devices: Electronic devices are devices that make use of high voltage electricity. E.g. electric grinding machine, printing machine.
4. Electronic Devices: Electronic devices on these parts are devices that use relatively low voltage supply. E.g. computer system, home appliances such as television, radio, and also office appliances.

Input Devices:

1. Graphics Tablets
2. Cameras
3. Video Capture Hardware
4. Trackballs
5. Barcode reader
6. Digital camera
7. Gamepad
8. Joystick
9. Keyboard
10. Microphone
11. Mouse (pointing device)
12. Scanner
13. Webcam
14. Touchpads
15. Pen Input
16. Microphone
17. Electronic Whiteboar
18. Magnetic Tape Drive

Output Devices:

1. Monitor (LED, LCD, CRT etc)
2. Printers (all types)
3. Plotters
4. Projector
5. LCD Projection Panels
6. Computer Output Microfilm (COM)
7. Speaker(s)
8. Head Phone
9. Visual Display Unit
10. Film Recorder
11. Microfiche

Both Input–OutPut Devices:

1. Modems
2. Network cards
3. Touch Screen
4. Headsets (Headset consists of Speakers and Microphone. Speaker act as Output Device and  Microphone act as Input device)
5. Facsimile (FAX)  (It has scanner to scan the document and also have printer to Print the  document)
6. Audio Cards / Sound Card

Assessment

List 5 input and output devices.

Week 4

Topic: Types and Uses Of Computer

Types of Computer

1. Analog Computer: Analog computers are computer that operate on value represented in form of continuous variables. That is, they are used for measuring physical condition, such as temperature, speed, pressure, e.t.c example are thermometer, barometer, volt meter, speedometer.
2. Digital Computer: Digital computers are computer that operate on data that represented in the form of discrete values. i.e they operate on digits or number. They are used for performing mathematical and logical operation on data. E.g. digital computer, programmable calculator, digital wrist watches, score board
3. Hybrid Computer: Hybrid computers are computer that combine they operation of analog and digital computer. That is they are used for both measurement and calculations. They are used in a specialized area such as scientific and technical application as well as researched institute. E.g. dispenser, exploration machine, weather forecast equipment.

Uses and Application of Computer

Computer system has wide area of application ranging from schools, banks, hospital, government, parastatals, scientific research.

Uses of Computer In School

1. It is used in keeping record and files of student and the entire school and staff
2. It is used for preparing examination question
3. It is used for preparing student result
4. It is used for classroom learning
5. It is used by teachers and student for making research.

Uses of Computer in Hospital

1. It is used for keeping patient records
2. It is used for diagnosis of patients ailment
3. It is used for measure body temperature
4. Analog computer is used to measure body pressure

Uses of Computer in Banks

1. It is used to calculate loan and money withdraw or deposit
2. Computer is used for keeping staff record
3. Computer is used to keep customers record
4. Computer is used to carryout daily banking transaction.
5. Computer is used for money transfer

Advantages of Computer

1. Computer makes work to be easy, fast and accurate
2. Computer can store large volume of data
3. Computer can be used to provide security to document
4. Computer can perform more than one task at a time
5. Computer can be used to send electronic mails to friend.

Disadvantages of Computer

1. Computer is very expensive
2. Computer depends on electricity mostly
3. Computer cannot operate on it own without human effort i.e. it is an electronic idiot
4. Computer can be used for fraud.

Assessment

Mention 2 uses of computer in the following places

1. School
2. Bank
3. Office
4. Auto-mechanic
5. Typist

Week 5

Topic: Fundamental Computer Operation

System start-up (switching on a computer). All computer component, cable and devices must be connected together, before switching on a computer system. To switch on the computer, simply press the power button on the system unit

When you switch on your computer system, the computer verifies its entire component in order to make it ready for performing operation. This process is called booting

Types of Booting

There are two types of booting

1. Cold Booting: Cold booting is the process of turning on the computer system for the first time. This is done by pressing the power button on the system unit and monitor.
2. Warm Booting: warm booting is the process of re-booting the already booted system without switching of the computer; the short cut is CRT, ALT + DEL keys to be pressed.

System Shut Down

When you’re done with what you are doing with the computer, it is very important you short down the computer do no form the habit of turning it on and off all the time you use it this may cause serious problem to compute system. Make sure all running applications and being saved and closed to avoid loss of files

Steps to Shut Down the Computer

1. Save and close all running application
2. Click on the start button on desktop
3. Click on turn off
4. Select turn off from the option displayed
5. Click ok and wait for minute while window is shorting down
6. Switch of the plug from the sockets.

Assessment

How can Computer be shut down?

Week 6

Topic: Internal Features of the System Unit

(CPU)The central processing unit is the brain of the computer system. It is responsible for all processing activities that take place within the computer system. It is also responsible for processing data given meaningful information.

Components of the CPU

The CPU consist of the three components

1. The Control.
2. The arithmetic and logic unit: this is the unit responsible for carrying out arithmetic operation such as addition, subtraction, multiplication and division on data. It also carries out logical operation such as comparing two items ( e.g >, <, =, etc)
3. Main memory: this is the unit that supervise, control and coordinates the execution of the program in a correct order.

It ensures the smooth operation of the hardware components, fetches and interprets instruction to the unit responsible for executing the instructions.

Main Memory: This is the part or the CPU that stores data to be processed well as the instruction for processing them. Data must be stored inside the main memory before they can be processed into information. It can also be called the main storage and primary storage.

ASSESSMENT

1. The CPU consist of the three components, HIGHLIGHT them?

Week 7

Topic: Screen Pointing Devices

A pointing device can be define as any hardware component that allows the user to input spatial data into the computer using physical gesture such as point click and drag.

Types of Pointing Devices

There are several pointing devices which are

1. Mouse: Mouse is an input device that is used for controlling the cursor on the computer monitor in order to point and select object or give command on the computer screen. It is usually placed on a mouse pad.

Two Types of Mouse
The most popular types of mouse are as follows:

(i) Mechanical Mouse: It has a small ball at the bottom. The ball rotates as the mouse is rolled over a flat surface. Usually, a rectangular rubber pad (known as mouse pad) is used as flat surface. As the mouse is rolled over the flat surface, the pointer moves in the same direction on the screen.

(ii) Optical Mouse: It has no ball at the bottom. It uses the laser technology to detect the mouse movement. Nowadays, it is commonly used in personal computers (PCs).

Functions of the Mouse

1. Clicking
2. Pointing
3. Double clicking
4. Right clicking.
5. Touch Pad

Touch Pad is a pressure-sensitive pointing device. Touch pad is also known as track pad. It is also stationary device like trackball but it has no moving arts. It is a small, flat surface (or sensitive pad) over which a user slides fingertip to move the pointer on the screen.

Touch Pad also has one or two buttons. These buttons are located near the pad. These buttons work like mouse buttons. Touch Pad is normally used with laptops. Nowadays, it is also available as separate input device. It is fixed on separate keyboard.

3.Trackball
A trackball is a pointing input device. It performs functions like a mouse but it is a stationary device. It has move-able ball on its top. The ball is rotated or rolled with fingers (or palm of the hand) to move the pointer on the screen. Like mouse, a trackball also has buttons used to send the commands to computer.

The trackball is usually available laptop compute. It is fixed on its keyboard. It is also available as separate input device.

ASSESSMENT

1. Define a pointing device?
2. List THREE types of pointing device?

Week 8

Topic: Mastery of the Keyboard

Definition of Keyboard

The Keyboard is an input device. It is used to send data into the computer system for processing.  The keyboard is used to communicate with the computer. It is used to enter data into the computer in form of digits, alphabets, symbols. A computer keyboard is an input device used to enter characters and functions into the computer system by pressing buttons, or keys. It is the primary device used to enter text. A keyboard typically contains keys for individual letters, numbers and special characters, as well as keys for specific functions. A keyboard is connected to a computer system using a cable or a wireless connection.

Types of Keyboard

There are two major types of keyboard which are

1. Standard Keyboard: The standard keyboard has less than 100 keys. It has 10 function keys labeled f1, f2, f3 —— f10 arranged vertically on the right side of the keyboard.
2. Enhanced Keyboard: An enhanced keyboard contain about 101/102 keys. It has twelve function key labeled f1, f2 ——– f12 arranged horizontally at the top of the keyboard.

Sections of the Keyboard

The keyboard has five different sections. Such as

1. Function Keys:This is the section that is used to perform specific function and short cut. It is label f1, f2, f3 —- f12.
2. Alphanumerical Keys: This is the section on the keypad that contain the alphanumerical character (A-Z) numerical character (0-9) punctuation mark (,”)
3. Control Keys:These are keys used to control the movement of the cursor on the monitor when performing operation
4. Numerical Keys:These are section of keys that contain numerical character and arithmetic operation
5. Special Keys: These are keys that contain the key that are used to perform special operation. The special keys are ALT, SHIFT, INSERT, WINDOW, and CTRL KEYS.

Keyboard

The keyboard

• Ctrl A – select all
• Ctrl B – bold
• Ctrl C – copy
• Ctrl D – duplicate
• Ctrl E – align to the centre
• Ctrl F – find
• Ctrl G – go to
• Ctrl I – italics
• Ctrl J – justify
• Ctrl K – insert
• Ctrl L – align to the left
• Ctrl M – increase indent
• Ctrl N – open new document
• Ctrl O – open
• Ctrl P – print
• Ctrl R – align to the right
• Ctrl S – save
• Ctrl T – increase indent of a line
• Ctrl U – underline
• Ctrl V – paste
• Ctrl W – close
• Ctrl X – cut
• Ctrl Y – redo
• Ctrl Z – undo.

The computer keyboard is basically divided into five sections made up of different keys that perform specific function, i.e.

• Alphanumeric keys sections: These are used to type alphabets and numbers (Aa-Zz) and (0-9). It contains symbols and special characters too.

• Numeric Keypad: These keys are extremely right of all modern computer keyboards.
• Function Keys: These are twelve in number F₁-F₂and are located horizontally on the first row of computer keyboard.

• Control Keys: They are used together with other keys to instruct the computer to perform special task they are Ctrl, Del, Esc and
• Cursor control keys or cursor manipulation key: This allows the user of a computer keyboard to move the cursor to the left, right, up one life and down one.

They are also called arrow keys.

Assessment

What keys do you use to perform the following functions

1. To undo an error ……..
2. To paste a copied content ……..
3. To cut a content
4. To do a central alignment of Text
5. To open a new document
6. To underline
7. To close a document
8. To align to the Left

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