📚 Class 2 Computer – Chapter 2: Computer Parts and Uses

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🔹 1. Introduction

A computer is an electronic machine that processes information and gives us results quickly.
To use a computer, we need to know its main parts and how they work.

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🔹 2. Main Parts of a Computer

A computer mainly has four parts:

2.1 Input Devices

• Purpose: To give data to the computer

• Examples:

  • Keyboard: For typing letters and numbers

  • Mouse: For pointing, clicking, and selecting items

  • Scanner: To scan images and documents

  • Microphone: To input sound

2.2 Output Devices

• Purpose: To receive results from the computer

• Examples:

  • Monitor: Shows text, images, and videos

  • Printer: Prints documents on paper

  • Speakers: Produces sound

2.3 CPU (Central Processing Unit)

• Purpose: The brain of the computer

• Function: Processes data and gives instructions to other parts

2.4 Storage Devices

• Purpose: To save information for later use

• Examples: Hard disk, USB, CD, DVD

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🔹 3. Types of Computers

1. Supercomputer: Very fast and powerful; used in weather forecasting, space research.

2. Mainframe Computer: Used by big organizations to store and process large data.

3. Personal Computer (PC): Used at home or school for work and learning.

4. Laptop / Notebook: Portable computer; can be used anywhere.

5. Tablet: Touchscreen portable device; easy to carry and use.

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🔹 4. Uses of Computers

1. Education: Learning, research, online classes

2. Communication: Email, video calls, messaging

3. Banking: Online transactions, account management

4. Entertainment: Games, movies, music

5. Business: Billing, inventory, data management

6. Science & Technology: Research, experiments, simulations

💡 Tip: Computers help save time, increase accuracy, and make work easy.

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🔹 5. How Computers Work

A computer works in four steps:

1. Input: Data is given using input devices (keyboard, mouse, etc.)

2. Processing: CPU processes the data

3. Storage: Data is stored in storage devices (hard disk, USB)

4. Output: Results are displayed using output devices (monitor, printer, speaker)

Example:

• Typing a story → CPU processes → Save on hard disk → Display on monitor

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🔹 6. Practice Questions / Revision

1️⃣ Name any two input devices.
✅ Answer: Keyboard, Mouse

2️⃣ Name any two output devices.
✅ Answer: Monitor, Printer

3️⃣ What is the brain of the computer?
✅ Answer: CPU (Central Processing Unit)

4️⃣ Name any two storage devices.
✅ Answer: Hard disk, USB

5️⃣ Give one use of computers in education.
✅ Answer: Learning, research, or online classes

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🔹 7. Summary

• Input Devices: Give data to the computer

• Output Devices: Show results from the computer

• CPU: Brain of the computer

• Storage Devices: Save data for future use

• Uses: Education, Communication, Banking, Business, Entertainment, Science

• Working: Input → Process → Storage → Output