📚 Class 2 Computer – Chapter 1: Introduction to Computer

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🔹 1. What is a Computer?

A computer is an electronic machine that can store, process, and display information.
It can perform tasks very quickly and accurately.

💡 Example: Calculators, laptops, desktops, tablets

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🔹 2. Characteristics of a Computer

1. Speed:

   • Computers can perform tasks very fast, much faster than humans.

2. Accuracy:

   • Computers give accurate results if correct instructions are given.

3. Storage:

   • Computers can store large amounts of data for future use.

4. Automation:

   • Computers can perform repeated tasks automatically.

5. Communication:

   • Computers can send and receive information over networks.

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🔹 3. Parts of a Computer

A computer has main parts:

3.1 Input Devices

• Purpose: To give data to the computer

• Examples: Keyboard, Mouse, Scanner, Microphone

3.2 Output Devices

• Purpose: To get results from the computer

• Examples: Monitor, Printer, Speakers

3.3 CPU (Central Processing Unit)

• Purpose: The brain of the computer. It processes all data and gives instructions.

3.4 Storage Devices

• Purpose: To store data

• Examples: Hard disk, USB, CD, DVD

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🔹 4. Types of Computers

1. Super Computer:

   • Very fast and powerful. Used for weather forecasting, space research.

2. Mainframe Computer:

   • Used by big organizations to handle large amounts of data.

3. Personal Computer (PC):

   • Used at home or school.

4. Laptop / Notebook:

   • Portable computer. Can work anywhere.

5. Tablet:

   • Touchscreen computer, portable and easy to carry.

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🔹 5. Uses of Computers

1. Education: Learning, research, and e-books

2. Communication: Email, video calls, chat

3. Banking: Online transactions

4. Entertainment: Games, movies, music

5. Business: Billing, inventory management

6. Science and Technology: Research and experiments

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🔹 6. How Computers Work

A computer works in four main steps:

1. Input: User gives data using input devices

2. Processing: CPU processes the data

3. Storage: Data is saved for future use

4. Output: Results are displayed using output devices

💡 Example:

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

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🔹 7. Practice Questions / Revision

1️⃣ What is a computer?
✅ Answer: An electronic machine that can store, process, and display information.

2️⃣ Name two input devices.
✅ Answer: Keyboard, Mouse

3️⃣ Name two output devices.
✅ Answer: Monitor, Printer

4️⃣ What is the brain of the computer?
✅ Answer: CPU (Central Processing Unit)

5️⃣ Name any two types of computers.
✅ Answer: Supercomputer, Personal Computer

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🔹 8. Summary

• Computer: An electronic device that stores, processes, and displays data

• Main Parts: Input, Output, CPU, Storage

• Types: Supercomputer, Mainframe, PC, Laptop, Tablet

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

• Working: Input → Process → Storage → Output