Summary of Computers and Major Historical Inventions

## Introduction Computer hardware is the physical part of a computer system — the devices you can touch and connect together to make a computer work. This guide explains common hardware components, how they interact, and practical uses you can relate to everyday tasks. > **Definition:** Hardware — the tangible parts of a computer system such as the keyboard, monitor, motherboard, and printer. ## Hardware vs Software Break the concept into two clear parts: ### Hardware - Physical components you can touch and replace. - Examples: **keyboard**, **mouse**, **monitor**, **printer**, **speakers**, **webcam**, **scanner**, **microphone**, **touch screen**, **joystick**, **trackball**, **plotter**, **GPS device**. ### Software - Programs and applications that run on hardware; you cannot touch them. - Examples: operating system, web browser, word processor, games. > **Definition:** Software — sets of instructions (programs) that tell hardware what to do. ## Input Devices (how data gets into a computer) Input devices send information into the PC. Each device is best for certain tasks: - Mouse — to click, move the cursor and scroll - Keyboard — to type text and commands - Microphone — to record voice, talk or sing - Scanner — to convert paper documents or photos into digital images - Webcam — to capture live video for calls or streaming - Touch screen — to directly tap and control the interface - Joystick / Trackball — used for gaming or specialized control Practical examples: - Use a **scanner** to digitize a printed certificate for emailing. - Use a **microphone** and **webcam** for a remote class or meeting. ## Output Devices (how a computer presents information) Output devices send information from the PC to the user or another medium: - Printer — to produce paper copies of documents and photos - Monitor (screen, display) — to view text, images, video - Speakers — to hear music, system sounds, or audio from videos - Headphones (earphones) — personal audio listening - Projector — to display the screen on a large surface for groups - Plotter — specialized printer for CAD drawings and large-format plans Practical examples: - Use a **monitor** and **speakers** to watch a video lesson. - Use a **printer** to produce a hard copy of a homework sheet. ## Comparing Input and Output Devices | Feature | Input Devices | Output Devices | |---|---:|---:| | Primary function | Send data to the computer | Receive data from the computer | | Common examples | Mouse, Keyboard, Scanner, Microphone, Webcam | Monitor, Printer, Speakers, Headphones, Projector | | Use case | Entering commands, text, images, or audio | Displaying results, printing documents, playing sound | ## How Devices Connect and Work Together - The **keyboard** and **mouse** send user commands to applications. - Applications process data (software) and send results to **monitor**, **printer**, or **speakers**. - Some devices are both input and output (e.g., touch screens: you input by touching and receive visual output on the same device). Fun fact: The same screen you use to view content can often act as an input when it is a touch screen, combining input and output roles in one device. ## Practical Tips for Not Attending Students 1. Identify devices available at home: list your input and output devices and their purpose. 2. For remote learning, ensure you have a working **microphone** and **webcam** for oral participation. 3. Scan and email documents using a **scanner** or a phone app that simulates a scanner. 4. Adjust **speaker** or **headphone** volume before joining audio calls to avoid feedback. ## Troubleshooting Basics - If the **keyboard** or **mouse** doesn’t respond, check cables or batteries and try a different USB port. - If the **monitor** shows no image, ensure it is turned on and connected to the computer’s video port (HDMI, VGA, DisplayPort). - If the **printer** won’t print, check paper, ink/toner, and the print queue in your software. > **Definition:*