Lesson Notes By Weeks and Term v3 - Junior Secondary 2
IT Gadgets
Download the Lessonotes Mobile Nigeria 2025 app for faster lesson access on Android and iPhone.
IT Gadgets
Download the Lessonotes Mobile Nigeria 2025 app for faster lesson access on Android and iPhone.
Subject: Information Technology (IT)
Class: Junior Secondary 2
Term: 3rd Term
Week: 7
Theme: Basic Knowledge Of Information Technology
This page supports the lesson note with a companion video and a short classroom-ready summary.
For class groups and homework, share this lesson page so learners also get the summary, objectives, and full lesson context.
differentiate between GSM, Fax machine and telephone; create and send messages to one another using the GSM and Fax; store and retrieve in for mation on a GSM handset.
This section provides in-depth explanations of the core IT gadgets for communication: the traditional telephone, the GSM mobile phone, and the Fax machine. 2.
1. Traditional Telephone (Landline Telephone) A traditional telephone is a telecommunication device that permits two or more users to conduct a conversation when they are too far apart to be heard directly.
Technology: Primarily uses wired connections (telephone lines) to transmit analogue or digital voice signals.
Components: Handset: Contains the speaker (receiver) and microphone (transmitter).
Dial Pad/Keypad: Used to input the recipient's phone number.
Base Unit: Connects to the telephone line and houses the ringing mechanism.
Functionality: Primarily designed for voice calls. Some modern versions may have caller ID or answering machine functions.
Portability: Generally fixed in one location (landline) or limited portability within a small radius (cordless phone).
Working Principle: Sound waves (voice) are converted into electrical signals by the microphone, transmitted through telephone wires to the receiving end, where a speaker converts the electrical signals back into sound waves.
Relevance in Nigeria: Still found in some offices, businesses, and a decreasing number of private homes, especially in areas with reliable fixed-line infrastructure. It provides a stable, clear connection less prone to network issues compared to early mobile networks. 2.
2. Global System for Mobile Communications (GSM) Mobile Phone A GSM mobile phone (commonly called a cell phone or just "phone") is a wireless handheld device that allows users to make and receive calls and send text messages (SMS) over a cellular network. Modern GSM phones (smartphones) offer a wide range of additional functionalities.
Technology: Operates wirelessly using radio waves to communicate with cellular base stations (masts). It requires a Subscriber Identity Module (SIM) card to connect to a network.
Components: Screen: Displays information, often touch-sensitive.
Keypad/Touchscreen: For inputting numbers, text, and commands.
Microphone and Speaker: For voice communication.
Antenna: For sending and receiving radio signals.
Battery: Provides power for portability.
SIM Card Slot: Holds the SIM card for network identification.
Camera: For taking photos and videos.
Internal Memory/SD Card Slot: For storing data.
Functionality: Voice Calls: Make and receive calls.
SMS (Short Message Service): Send and receive text messages.
MMS (Multimedia Messaging Service): Send and receive messages with images, audio, video.
Internet Access: Browse the web, use social media, email.
Camera: Capture photos and videos.
Applications (Apps): Install and use various software programs (e.g., mobile banking, educational apps, games).
Storage: Store contacts, messages, photos, videos, documents.
Portability: Highly portable and can be used anywhere within network coverage.
Working Principle: The mobile phone sends and receives radio signals to and from the nearest base station (cell tower). These base stations are connected to a mobile switching center, which routes calls and messages to their destination, whether another mobile phone or a landline.
Relevance in Nigeria: Extremely widespread and indispensable. Used for personal communication, mobile banking (USSD, apps), online learning, business transactions (POS, marketing), news, and entertainment. 2.
3. Fax Machine (Facsimile Machine) A Fax machine is a device used to transmit scanned printed materials (text, images, or both) over a telephone network to a receiving fax machine, which then prints a copy of the original document.
Technology: Uses a standard telephone line to transmit document images. It converts scanned images into electrical signals, sends them, and the receiving machine converts them back into an image for printing.
Components: Scanner: To digitize the original document.
Printer: To print the received document.
Modem: To convert digital data into analogue signals for transmission over the telephone line and vice versa.
Telephone Handset/Keypad: For dialing and sometimes for voice communication before sending the fax.
Document Feeder/Tray: To hold the documents to be scanned.
Functionality: Primarily for sending and receiving hard copies of documents electronically.
Portability: Generally fixed in one location, similar to a traditional telephone, as it needs to be connected to a power source and a telephone line.
Working Principle:
1. The user places the document into the fax machine's feeder.
2. The digital data into analogue signals for transmission over the telephone line and vice versa.
Telephone Handset/Keypad: For dialing and sometimes for voice communication before sending the fax.
Document Feeder/Tray: To hold the documents to be scanned.
Functionality: Primarily for sending and receiving hard copies of documents electronically.
Portability: Generally fixed in one location, similar to a traditional telephone, as it needs to be connected to a power source and a telephone line.
Working Principle:
1. The user places the document into the fax machine's feeder.
2. The machine scans the document, converting it into a bitmap image (digital data).
3. This digital data is then converted into analogue signals by a modem.
4. The machine dials the recipient's fax number via the telephone line.
5. The analogue signals are transmitted over the telephone line.
6. The receiving fax machine's modem converts the analogue signals back into digital data.
7. The receiving machine's printer then prints the document.
Relevance in Nigeria: Less common now due to email and digital document sharing, but still used in some government offices, legal firms, and older businesses where hard copies of signed documents are legally required or where digital infrastructure is limited. 2.
4. Differentiating between GSM, Fax Machine, and Traditional Telephone | Feature | Traditional Telephone | GSM Mobile Phone | Fax Machine | | :------------------ | :---------------------------------------- | :----------------------------------------------- | :-------------------------------------------------- | | Primary Function| Voice communication | Voice, text (SMS), data (internet), multimedia | Document transmission (text and images) | | Connectivity | Wired (landline) or short-range wireless (cordless) | Wireless (cellular network via SIM card) | Wired (uses a telephone line for transmission) | | Portability | Low (fixed or limited range) | High (can be used anywhere with network coverage)| Low (fixed, requires power and phone line) | | Data Type | Voice | Voice, text, images, video, data | Images of documents (text, graphics) | | Input/Output | Keypad, microphone, speaker | Keypad/Touchscreen, mic, speaker, camera, screen | Scanner, printer, keypad, modem | | Core Medium | Electrical signals over wires | Radio waves over cellular network | Analogue signals over telephone lines | | Cost of Use | Per-call/monthly subscription | Per-call/per-SMS/data bundle/monthly subscription| Per-page/per-transmission (via phone bill) | | Required Card | None (requires telephone line) | SIM (Subscriber Identity Module) card | None (requires telephone line connection) | | Internet Access | No | Yes (on smartphones) | No | 2.
5. Creating and Sending Messages Using GSM (SMS) Sending an SMS (Short Message Service) message on a GSM phone is a fundamental communication skill.
Steps:
1. Unlock Phone: Wake up and unlock the mobile phone.
2. Access Messaging App: Locate and tap the "Messages" or "SMS" application icon on the phone's home screen or app drawer.
3. Start New Message: Tap the "New message," "Compose," or "+" icon (usually located at the bottom right or top right of the screen) to start writing a new message.
4. Enter Recipient: Type the recipient's phone number directly into the "To" or "Recipient" field. Alternatively, tap the "Contacts" icon (often a silhouette of a person or a small address book icon) to select a contact from the phone's address book.
5. Type Message: Tap into the "Text message," "Type message," or "Enter text" field and use the on-screen keyboard (or physical keypad) to type the desired message.
6. Send Message: Tap the "Send" button (often represented by a paper airplane icon or simply "Send") to transmit the message. A confirmation or "Sent" status usually appears. 2.
6. Creating and Sending Messages Using Fax Sending a message via a Fax machine involves preparing a physical document. Steps (Conceptual for classroom demonstration):
1. Prepare Document: Ensure the document to be sent is clean, flat, and free of staples or tears.
2. Load Document: Place the document face down or face up (depending on the machine's design) into the fax machine's document feeder tray.
3. Enter Recipient's Fax Number: Use the fax machine's keypad to dial the recipient's fax number.
4. Initiate Transmission: Press the "Send," "Start," or "Fax" button. The machine will dial the number, connect to Sending a message via a Fax machine involves preparing a physical document. Steps (Conceptual for classroom demonstration):
1. Prepare Document: Ensure the document to be sent is clean, flat, and free of staples or tears.
2. Load Document: Place the document face down or face up (depending on the machine's design) into the fax machine's document feeder tray.
3. Enter Recipient's Fax Number: Use the fax machine's keypad to dial the recipient's fax number.
4. Initiate Transmission: Press the "Send," "Start," or "Fax" button. The machine will dial the number, connect to the receiving fax machine, scan the document, and transmit it.
5. Confirmation: Wait for a confirmation message on the fax machine's display indicating whether the transmission was successful or failed. 2.
7. Storing and Retrieving Information on a GSM Handset GSM phones are powerful personal information management tools.
Storing Information: Contacts:
1. Access the "Contacts" or "Phonebook" app.
2. Tap "Add New Contact" or "+" icon.
3. Enter the contact's name, phone number, and any other details (email, address).
4. Tap "Save." SMS Messages: Messages are automatically stored in the "Messages" app's "Inbox" or "Sent" folders. No manual storage step is usually required for received or sent messages.
Photos/Videos: Captured via the "Camera" app, they are automatically saved to the phone's internal memory or an inserted SD card, accessible via the "Gallery" or "Photos" app. Files (Documents, Audio): Can be downloaded from the internet, received via Bluetooth/email, or created using apps. They are usually stored in specific folders (e.g., "Downloads," "Documents") and accessed via a "File Manager" app.
Retrieving Information: Contacts:
1. Open the "Contacts" app.
2. Scroll through the list or use the "Search" bar (often a magnifying glass icon) to find a contact by name.
3. Tap on the contact's name to view their details or initiate a call/message.
SMS Messages:
1. Open the "Messages" app.
2. Navigate through conversations (chats) to find the desired message. Messages are typically grouped by sender/recipient.
3. Tap on a conversation to view its history.
Photos/Videos:
1. Open the "Gallery" or "Photos" app.
2. Browse through albums (e.g., "Camera," "Screenshots," "Downloads") or use the search function if available.
3. Tap on a photo/video to view it.
Files:
1. Open the "File Manager" or "My Files" app.
2. Navigate through folders (e.g., "Internal Storage," "SD Card," "Downloads," "Documents") to locate the specific file.
3. Tap on the file to open it with the appropriate application. This section outlines practical, teacher-led, and student-centred activities suitable for a Nigerian classroom, encouraging engagement and hands-on experience where possible. 3.
1. Teacher Activities Introduction & Engagement (10 minutes): Display pictures or, if available, actual examples of a traditional telephone, a basic GSM mobile phone, and a picture/diagram of a Fax machine. Ask students to identify each gadget and share what they know about its use. Briefly introduce the lesson's objectives. Concept Explanation and Demonstration (20 minutes): Explain each gadget (Traditional Telephone, GSM, Fax Machine) in detail, covering its definition, technology, components, and primary functions. Use clear, simple language and real-world Nigerian examples (e.g., calling relatives in the village, using mobile money, sending official documents). Use the provided table (or draw it on the board) to systematically differentiate between the three gadgets, highlighting key differences in portability, functionality, and connectivity.
Demonstrate GSM SMS: Using a projector connected to a mobile phone (or a visual simulator/emulator), demonstrate the step-by-step process of creating and sending an SMS message. Emphasize how to select a contact or type a number, compose the message, and send it. If a projector is unavailable, demonstrate on an actual phone by passing it around (under strict supervision) or drawing on the board.
Explain Fax Process: Since a physical fax machine is unlikely, explain the steps for sending a fax using a clear diagram or pictures. Emphasize the need for a physical document and a telephone line.
Demonstrate GSM Storage/Retrieval: Using the same method as SMS demonstration, show how to: Save a new contact (e.g., "Mr. Emeka - 0803XXXXXXX"). Retrieve an existing contact. Navigate the "Messages" app to find an old message. Access photos/videos in the "Gallery" and briefly mention the "File Manager" for other documents.
Guided Discussion and Q&A (10 minutes): Facilitate a short Q&A session to check for understanding. Encourage students to ask questions about any confusing aspects.
Pose questions like: "If you want to quickly tell your mother 'I'm home', which device would you use?", "Which device would a lawyer use to send a signed agreement?", etc. 3.
2. Student Activities Brainstorming & Identification (5 minutes): Students independently list as many communication gadgets as they know before the teacher's introduction. During the teacher's introduction, students identify the displayed gadgets and share their prior knowledge.
Active Listening & Note-Taking (Ongoing): Students actively listen to explanations and demonstrations, taking notes on key definitions, components, and steps. Group Discussion & Scenario Analysis (10 minutes): Divide students into small groups (4-5 students). Provide each group with a few scenarios related to communication needs (e.g., "A market woman wants to quickly inform her customer that goods have arrived," "A government office needs to send a formal document with a signature"). Groups discuss which gadget is most appropriate for each scenario and why, focusing on the differences learned. Practical Practice (20 minutes - if resources allow): SMS Practice: If students are allowed to bring basic feature phones (or if a few classroom phones are available), pair them up. One student composes and sends a simple text message (e.g., "Hello, my name is [Your Name]") to their partner's phone. The partner then retrieves and reads it. (Teacher must supervise closely and set clear rules).
Contact Storage Practice: Using a class phone or their own (if permitted), students practice saving a new contact with dummy information (e.g., "Teacher IT - 090XXXXXXX") and then retrieving it.
Message Retrieval Practice: Students navigate their own (or class) message app to find the oldest message or a specific message from a designated sender.
Reporting (5 minutes): Each group briefly reports their findings from the scenario analysis. Students share their practical experiences, difficulties encountered, and successes.
This topic has widespread applications in daily Nigerian life, integrating into various aspects of community, economy, and personal interaction. Enhancing Business and Economic Activities: Mobile Money/POS Agents: GSM phones are indispensable for mobile money transfer services, allowing agents to process deposits, withdrawals, and bill payments even in remote areas. This facilitates financial inclusion for many Nigerians without traditional bank accounts.
Small and Medium Enterprises (SMEs): Entrepreneurs use GSM phones for marketing (e.g., bulk SMS), customer service, order taking, and coordinating logistics, enabling them to reach a wider customer base beyond their immediate locality. Fax machines, though less common, are still used in some formal businesses for sending signed invoices or contracts.
Market Communication: Farmers or traders can quickly communicate market prices or availability of goods using GSM phones, impacting supply chains and reducing waste. Improving Communication and Emergency Services: Family and Community Connectivity: GSM phones enable Nigerians to stay connected with family members, relatives, and friends across vast distances, facilitating social cohesion and reducing the feeling of isolation for those living far from home.
Emergency Response: In critical situations, GSM phones are vital for contacting emergency services (e.g., police, fire service, ambulance) by dialing universal emergency numbers like 112, significantly reducing response times.
Health Information Dissemination: Health agencies use SMS to send public health alerts or vaccination reminders to communities. Facilitating Education and Information Access: E-learning and Research: Students and teachers use GSM smartphones to access online learning platforms, conduct research, and communicate about assignments, especially where computers are scarce.
School Communication: Schools use bulk SMS or WhatsApp groups (via GSM phones) to disseminate information to parents regarding school events, holidays, or student performance.
News and Current Affairs: GSM phones provide immediate access to news and current affairs via various news apps and websites, keeping citizens informed about local, national, and international events.