Different Parts of a Computer : Explanation:

 

🖥️ Different Parts of a Computer

A computer is made up of two main parts:

1. Hardware (physical parts)

2. Software (programs)

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1️⃣ Hardware

Hardware means the physical components of a computer that we can see and touch.

🔹 A) Input Devices

Input devices are used to enter data and instructions into the computer.

Examples:

• Keyboard – used to type text and numbers

• Mouse – used to point, click, and select

• Scanner – converts paper documents into digital form

• Microphone – used to input sound

• Webcam – used to input images/video

👉 Function: Send data to the computer.

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🔹 B) Central Processing Unit (CPU)

The CPU is the brain of the computer. It controls all operations.

The CPU has three main parts:

1. ALU (Arithmetic Logic Unit)

• Performs calculations (addition, subtraction, comparison, logic)

2. CU (Control Unit)

• Controls and coordinates all activities of the computer

• Directs input, processing, and output

3. Registers

• Very small, very fast memory inside the CPU

• Stores data temporarily during processing

👉 Function: Processes data and controls the system.

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🔹 C) Memory (Storage Unit)

Memory stores data, instructions, and results.

🔸 Primary Memory (Main Memory)

• RAM (Random Access Memory)

  • Volatile (data lost when power off)

  • Stores running programs

• ROM (Read Only Memory)

  • Non-volatile

  • Stores permanent instructions like BIOS

🔸 Secondary Memory

• Permanent storage

• Used to store large amounts of data

Examples:

• Hard Disk / SSD

• Pen Drive

• CD / DVD

• Memory Card

👉 Function: Stores data permanently.

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🔹 D) Output Devices

Output devices display the result of processing.

Examples:

• Monitor – displays text and images

• Printer – produces hard copy

• Speaker – outputs sound

• Projector – displays output on large screen

👉 Function: Shows results to the user.

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2️⃣ Software

Software is a set of instructions that tells the computer what to do.

🔹 A) System Software

Controls the working of the computer.

Examples:

• Operating System (Windows, Linux, macOS)

• Device drivers

👉 Function: Acts as a bridge between user and hardware.

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🔹 B) Application Software

Used to perform specific tasks.

Examples:

• MS Word – typing documents

• MS Excel – calculations

• MS PowerPoint – presentations

• Browser (Chrome, Firefox)

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🔹 C) Utility Software

Helps in maintenance and security.

Examples:

• Antivirus

• Disk Cleanup

• Backup tools

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🧠 Block Diagram (In Words)

Input Devices → CPU (Processing) → Output Devices
↓
Memory

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⭐ One-Line Exam Summary

• Input Unit: Takes data

• CPU: Processes data

• Memory: Stores data

• Output Unit: Displays result