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Key Point: Computer System = Hardware + Software + Data + Users
What is a Computer System?
A computer system is a combination of electronic machines and programs that help us perform tasks. It takes information (input), works on it (process), shows results (output) and can save information for later (storage).
Main Parts of a Computer System
How a Computer Works (Simple Steps)
Key Features
Everyday Examples – Computers are in schools (computer labs), homes (laptops, tablets), shops (billing machines), banks (ATMs), buses/trains (timing systems), and phones (smartphones).
Care and Safety
Key Point: Computer = Hardware + Software
What is Hardware?
Hardware is the physical parts of a computer you can touch. Examples: monitor, keyboard, mouse, CPU (computer box), printer, speakers, RAM (memory chips), hard disk (storage). Hardware devices are grouped by their job:
What is Software?
Software is the set of instructions or programs that tell the hardware what to do. You cannot touch software. It runs on hardware and makes the computer useful.
How they work together
Hardware and software must work together. The hardware performs actions when the software gives instructions. For example, when you type a letter in a word processor (software), the keyboard (hardware) sends keys to the CPU (hardware), which the software uses to display letters on the monitor (hardware).
Simple analogy: Hardware is like the body and tools; software is like the brain and instructions. The brain tells the body what to do and the body performs the work.
Why both are important: Without hardware, software cannot run. Without software, hardware would be useless metal and plastic. Together they form a working computer.
Tips for students: Learn the names and functions of basic hardware parts and common software you use at school. Practice turning devices on/off correctly and saving your work often.
Key Point: Input Device → Data (raw) → Computer (processing) → Output (information)
What are input devices? Input devices are parts of a computer system that let us give information and instructions to the computer. They change what we type, touch, speak, or show into signals the computer can understand.
Why they are important: Without input devices we cannot tell the computer what to do. They are the first step in turning real-world actions into digital information that the computer can process.
Types and how they work (simple):
How data flows: We use an input device to send data to the computer. The computer processes it (brain), and then shows results through output devices like monitors or printers.
Class activity idea: Give students a picture and ask them to use a scanner or camera to make a digital copy, then type a caption using a keyboard and show it on the screen. This demonstrates capture + input + processing + output.
Care and safety tips: Keep devices clean and dry, press keys gently, do not drop delicate devices (microphones, cameras), and follow teacher instructions when connecting devices.
Key Point: Screen resolution = width (pixels) × height (pixels) — e.g., 1920 × 1080 pixels.
What are Output Devices?
An output device is any hardware that receives information from a computer and shows it to us in a form we can use — for example, pictures on a screen, printed pages, or sound through speakers. Output devices help us see, hear, or touch the results of the computer's work.
Common types and how they work (simple):
Dual-purpose devices: Some devices, like a touchscreen, can be both input and output. A touchscreen shows information and also senses touch.
Why they are important: Output devices let us read results, share work on paper, listen to music or instructions, and display information to groups (with a projector). They turn computer data into forms we can understand.
Care and safety (simple tips):
Class activity idea: Ask students to name output devices they use at home or school and draw one. Then group by visual, audio, and printed outputs.
Key Point: 1 KB = 1024 bytes
What are storage devices? A storage device is a part of a computer system that keeps information (data and programs) so you can use it now or later. Storage devices hold files like pictures, songs, homework and software.
Types of storage
Key characteristics
How they are used in real life
Simple rules to remember
Key Point: 1 byte = 8 bits
What is the System Unit?
The system unit is the main box or case of a desktop computer that holds most of the important parts that make the computer work. It is different from the monitor, keyboard and mouse which are called external devices.
Main internal components and simple explanations (with everyday analogies):
How parts work together (simple data flow):
When you open a program, the CPU requests the program from storage, the program is loaded into RAM so the CPU can use it quickly. The CPU processes the data, the GPU may draw what you see on the screen, and the PSU keeps everything powered. The motherboard connects all these parts so they communicate.
Safety and care tips:
Key Point: 1 byte = 8 bits
What are computers and devices? Computers are electronic machines that process data and give information. Devices are tools that help us use computers — they let us give information to computers (input), see or hear results (output), or store data.
How we group computers — Computers are often classified by size, power and use. Here are the common types:
Types of devices around a computer
Key differences (easy way to remember)
Everyday examples — banks use servers and mainframes, teachers and students use desktops and laptops, parents use smartphones and tablets, traffic lights and smart TVs use embedded systems, hospitals use computers for patient records and diagnostic machines.
Safety and care tips for students
Key Point: 1 byte = 8 bits (useful when comparing data sizes and speeds).
Peripherals are devices that are connected to a computer to send information to it (input), get information from it (output), or store information. Common types:
Peripherals connect to the computer using cables and ports (USB, HDMI, audio jack, Ethernet) or wirelessly (Bluetooth, Wi‑Fi). Many modern devices are "plug and play," meaning the computer recognizes them automatically.
Networking devices help computers talk to each other and share information or resources (like printers and internet). Key networking devices:
How they work together: in a typical classroom, computers (with keyboards and monitors) are connected by Ethernet cables to a switch; the switch connects to a router, the router connects to a modem to get internet access. A networked printer can be used by every computer on that network.
Care and safety: keep peripherals clean, unplug properly, protect storage devices from moisture and extreme heat, use secure Wi‑Fi passwords to keep a network safe.
Key Point: Available Memory = Total Memory - Used Memory
What is an Operating System (OS)?
An Operating System is special software that helps the computer or device work. It manages the computer’s parts (like the CPU, memory and disk), runs programs, and gives you a way to use the machine. You can think of the OS as the manager or the principal of a school who makes sure everything runs smoothly.
Why do we need an OS?
Basic Functions of an Operating System (simple explanations)
Simple analogy summary: The OS is like the school principal + librarian + traffic warden: it organizes, controls and protects everything so learning (programs) can happen safely and smoothly.
Key Point: Power (electrical safety): P = V × I — where P is power in watts, V is voltage (volts) and I is current (amperes). Useful to understand why faulty chargers or cables can be dangerous.
What it means
Care, safety and handling of computers means keeping computers clean, safe from damage, and using them in ways that protect both the user and the machine. This includes physical care (cleaning and storing), electrical safety, ergonomic use, data protection and safe internet behaviour.
Physical care and handling
Electrical safety
Ergonomic safety (comfort and health)
Data and software safety
Internet safety
Classroom and home rules (quick checklist)
Why this matters
Good care extends the life of computers, keeps data safe, prevents accidents and helps you work more comfortably and effectively.
Key Point: Storage conversions: 1 KB = 1024 Bytes; 1 MB = 1024 KB; 1 GB = 1024 MB
Computers are electronic machines that can store, process and show information very quickly. They help people in many areas of life by making tasks faster, easier and more accurate. A computer works when you give it input (like typing), it processes the information using software and hardware (like the CPU and programs), and then gives output (like a picture or a printed page). It can also save information (storage) so we can use it later.
Key Point: Battery percentage = (current charge ÷ full charge) × 100
What it is: Basic troubleshooting and maintenance means simple steps you can take to find and fix common computer problems and to keep a computer working well for a long time.
Common small problems:
Simple step-by-step troubleshooting (use in order):
Basic maintenance (things to do regularly):
Safety and care tips: Do not open electronic parts unless you are trained. Do not pull cables roughly. Keep liquids away. Turn off and unplug before cleaning ports or changing parts.
When to call an expert: If there are strange smells or smoke, repeated failures after trying basic steps, physical damage, or you need to open the inside of the computer.
Key Point: 1 KB = 1024 bytes
This glossary lists and explains the important words related to computer systems and devices for Class 5. Each term is described in simple language so you can understand what parts make a computer work and how they interact.
How parts work together (simple flow): Input devices provide data → CPU and memory process it → result is shown on output devices and saved on storage as a file. The OS manages all these tasks.
Tips to remember: keep hardware safe and clean, save your work often to secondary storage, and close apps you are not using to free up RAM.