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Key Point: Computer = Hardware + Software
What is a computer? A computer is an electronic machine that helps us do many tasks quickly. It can take information (input), work on it (process), and give results (output). Computers can store information for later use.
Main parts of a computer:
How a computer works (simple steps):
Why computers are useful: They help us learn, play, communicate, draw, write stories, do maths, and find information fast.
Simple safety and care tips: Keep food and water away, switch off the computer properly, do not pull cables, and ask an adult for help if something goes wrong.
Mini activity idea for class: Ask pupils to name input and output devices in their classroom and draw a simple labelled diagram of a computer showing monitor, keyboard, mouse, and CPU.
Key Point: Memory size conversions (useful when talking about storage): 1 KB = 1024 bytes, 1 MB = 1024 KB, 1 GB = 1024 MB.
What is the System Unit? The system unit (also called CPU box, computer box or tower) is the main part of a computer that holds the electronic parts which do the work. It is usually a metal or plastic box placed under or beside the monitor (for a desktop) or inside the laptop case.
Main job: It processes information, stores data, and controls how other parts of the computer work. The system unit does the 'thinking' and 'memory' work for the computer.
Safety note: Do not open the system unit without an adult or a trained person. Inside there are small parts and electrical connections.
Key Point: Total pixels = width in pixels × height in pixels (e.g., 1920 × 1080 = 2,073,600 pixels)
A monitor is the screen of a computer that shows pictures, words and videos. It is an output device because it displays (outputs) information from the computer for us to see. When you type on the keyboard or move the mouse, the monitor shows what you do.
Main parts of a monitor include:
How it works simply: the computer sends video signals to the monitor, and the monitor lights up pixels on the screen in different colors to form letters, pictures and videos.
Common monitor types (simple terms):
Other useful words:
Key Point: Words per minute (WPM) ≈ (Total characters typed ÷ 5) ÷ Minutes taken
Keyboard
A keyboard is an input device that looks like a set of buttons (keys). We press keys to type letters, numbers and to give commands to the computer. A keyboard helps us write stories, do homework, play some games and control the computer.
Main parts of a keyboard
How it works (simple): When you press a key, the keyboard sends a small electrical signal to the computer. The computer reads this signal and shows the correct letter or action on the screen.
Types of keyboards: wired (connects with a cable), wireless (connects by Bluetooth or wireless receiver), laptop built-in keyboards, and on-screen (virtual) keyboards on tablets and phones.
Care and safety tips: keep it clean (wipe gently), do not eat or drink over it, press keys gently, and keep liquids away.
Why keyboards are important: They let us type quickly and accurately, write messages, search the Internet and use many software programs.
Fun note: The standard letter arrangement is called QWERTY, named after the first six letters on the top left row.
Key Point: Cursor movement on screen ∝ physical mouse movement × pointer sensitivity (simple proportional relation).
A mouse is a hand-held pointing device used with a computer. When you move the mouse on a surface, the cursor (pointer) on the screen moves in the same direction. A mouse helps you click, select, drag and drop items on the screen.
Key Point: Cost per page = Total cost of ink or toner cartridge / Number of pages the cartridge can print
What is a printer?
A printer is an output device that takes information from a computer and prints it on paper. It turns the words, pictures and drawings you see on the screen into a physical copy you can hold.
How a printer works (simple):
Main parts of a printer (easy names):
Types of printers (short):
How we use printers in daily life: At home we print homework, drawings and photos. At school or office we print worksheets, certificates, reports and tickets. Printers help turn digital work into paper that we can read, share or keep.
Care tips for young users: Always ask an adult to change ink or toner. Keep paper dry and straight in the tray. Don’t put fingers near moving parts while the printer is working.
Key Point: v = f × λ — Speed of sound (v) equals frequency (f) times wavelength (λ). (Shows relation between pitch and wave length.)
What are Speakers and Microphones?
A microphone is an input device that captures sound (your voice or other noises) and converts it into an electrical signal that a computer or recorder can store. A speaker is an output device that converts electrical signals back into sound so we can hear it.
How they work (simple):
Parts you might hear about: diaphragm (moves with sound), coil and magnet (help change motion and electricity), wires or wireless connections, and a housing (the body of the device).
Role in a computer: A microphone is an input device (it gives sound to the computer). A speaker is an output device (it plays sound from the computer).
Types (simple): Built-in (inside a laptop/tablet), external (plug-in or USB), wireless (Bluetooth), headphones (small speakers you wear), and headset (microphone + headphones).
Safety & use tips for children: Keep volume at a safe level to protect ears. Use a microphone for clear voice in online class and a speaker to listen to stories, music or teacher's voice.
Key Point: Pixels = width (pixels) × height (pixels)
Scanner: A scanner is a device that takes a picture of a paper page, drawing or photo and turns it into a picture file on the computer. You place the paper glass under a lid and the scanner light moves under the paper to 'read' the image. The computer then saves it as a file (like a JPG or PNG).
Webcam: A webcam is a small camera that is usually fixed on top of a computer screen or built into a laptop. It takes live pictures (video) of you and sends them to the computer so you can do video calls, record videos, or take photos.
How they work (simple):
Parts you can see:
Simple tips: Keep the scanner glass clean for clear scans. For webcams, make sure the light is front-facing (you face the light) so your face is bright during a video call.
Key Point: 1 byte = 8 bits
Storage devices are parts of a computer that keep information (data and programs) so we can use them now or later. Some storage is temporary (works only while the computer is on) and some is permanent (keeps data even when the computer is off).
Types of storage:
How they work (simple): you create or open a file, choose "Save", and the computer writes the information to a storage device. When you open the file later, the computer reads it from that device.
Important ideas:
Key Point: Input → Processing → Output (basic IPO model showing how computers work)
What is an input device?
An input device is any part of the computer that we use to give information or instructions to the computer. We use input devices to tell the computer what to do — for example, to type letters, move the cursor, take a picture, or record our voice.
Why are input devices important?
Without input devices a computer cannot receive instructions from people. Input devices let us enter text, numbers, sounds and pictures so the computer can process them.
Common input devices (simple description):
How input devices work (in simple steps):
Short safety and care tips:
Key Point: Input + Processing = Output (conceptual formula showing how computers work)
What are Output Devices?
An output device is any part of a computer that takes information from the computer and shows it to us in a form we can understand — for example as pictures, words, sounds or printed pages. Output devices turn the computer's electronic signals (binary) into human-friendly forms.
Types of output:
How they help us (simple flow):
1. We give information to the computer using an input device (like a keyboard).
2. The computer processes the information.
3. The output device shows the result (on screen, on paper, or as sound).
Everyday examples: The monitor shows a homework file, the printer produces your school worksheet on paper, and speakers play a story or song.
Care and simple tips for children:
Key Point: Time to transfer a file = File size ÷ Transfer speed (for example: 100 MB ÷ 50 MB/s = 2 seconds).
What are connecting devices and ports?
Connecting devices (also called peripherals) are things we join to a computer so it can do more work. Ports are the holes or sockets on a computer where we plug in these devices. Ports can be on the front, back or sides of a computer or on a tablet and laptop.
Common ports and the devices they use
How to connect devices (easy steps)
Wired vs wireless
Some devices use wires (mouse with USB), and some are wireless (Bluetooth headphones). Wireless devices do not use a physical port, but the computer still needs a way (like Bluetooth) to connect to them.
Why ports are important
Ports let us add new tools to the computer so we can print, listen to music, watch on a bigger screen, or use the internet. Knowing which port to use makes connecting easy and safe.
Safety tips
Key Point: ON = 1, OFF = 0 (binary representation used in computers)
Switching On and Off means starting and stopping an electronic device such as a computer. When a device is switched ON it receives power and becomes ready to work. When it is switched OFF it stops working and power is removed.
How to switch ON a computer (basic steps):
How to switch OFF a computer (basic steps):
Safety rules and good habits: Always save your work before switching off, do not pull out the plug while the computer is running, avoid touching power plugs with wet hands, and use the proper shutdown option to protect files and hardware.
Simple idea used in computers: Electronic devices often have only two states — ON or OFF. Computers use tiny signals called bits to show these states: ON = 1 and OFF = 0.
Key Point: 20-20-20 rule: Every 20 minutes look at something 20 feet (≈6 metres) away for 20 seconds to rest your eyes.
What is Care and Safety of Computer?
Care and safety of a computer means using it in a way that keeps the machine working well for a long time and keeps people safe. This includes looking after the parts (monitor, keyboard, mouse, CPU), keeping the computer clean, using electricity safely, sitting properly while using it, and protecting data and software.
How to take care of a computer (simple steps):
Safety for your body (ergonomics):
Keeping data and software safe:
Things to avoid:
Following these simple rules helps the computer last longer and keeps everyone safe.
Key Point: Computer = Hardware + Software
What this topic covers
"Activities and Exercises" for the chapter Parts of a Computer help young learners practice recognising and using computer parts. These activities are simple hands-on tasks, games, and worksheets that reinforce the names, functions and safe use of a computer's parts (monitor, CPU, keyboard, mouse, speakers, printer, etc.).
Typical activities
How these help
Teacher tips