What is a Computer?
Delhi Police Exam
1. What is a Computer?
A computer is an electronic device that accepts data, processes it, stores it, and produces meaningful information as output.
Input → Process → Output → Storage
Programmable Electronic Device
Works on Given Instructions
Produces Meaningful Information
Simple Definition: A computer is a programmable electronic device that takes input, processes it according to given instructions, and provides output.
2. Characteristics of a Computer
Key Features
| Characteristic | Explanation | Example |
|---|---|---|
| Speed | Performs millions of calculations per second | Solving complex equations instantly |
| Accuracy | Delivers correct results when input is correct | Banking transactions |
| Storage | Can store vast data for future use | Files, videos, documents |
| Versatility | Can perform different types of tasks | Watching movies, programming, designing |
| Diligence | Doesn't get tired or bored | Works 24×7 without breaks |
| Automation | Works automatically once instructions are given | Automatic billing, ATMs |
| Connectivity | Connects to other devices and networks | Internet, Wi-Fi, Bluetooth |
3. Basic Components of a Computer
Five Main Components
1. Input Unit
Devices used to enter data into the computer
Example: Keyboard, Mouse, Scanner, Microphone
2. Processing Unit (CPU)
Known as the brain of the computer, it processes data and controls other parts
ALU (Arithmetic Logic Unit):
Performs mathematical and logical operations
CU (Control Unit):
Directs all operations inside the computer
Registers:
Small memory areas for temporary storage
3. Memory/Storage Unit
Stores data temporarily or permanently
Primary Memory:
RAM, ROM
Secondary Memory:
Hard Disk, Pendrive, CD/DVD
4. Output Unit
Displays or produces results after processing
Example: Monitor, Printer, Speaker
5. Communication Devices
Used to connect computers to networks or other systems
Example: Modem, Router, Bluetooth, Wi-Fi
4. Computer Working Cycle (IPO Cycle)
Input → Process → Output → Storage
Input
Data entered by user
Process
CPU processes data
Output
Result is displayed
Storage
Information saved for future
Example: MS Word
Typing text → (Input)
Editing text → (Process)
Displaying text → (Output)
Saving the file → (Storage)
5. Common Delhi Police Exam Facts
CPU is called the brain of the computer
ALU performs mathematical and logical operations
Device to convert data into readable form → Output device
RAM is volatile memory (data lost when power off)
Full form of ROM is Read Only Memory
Computer follows IPO Cycle
6. Quick Recap
| Concept | Summary |
|---|---|
| Definition | A computer is an electronic device that processes data into meaningful information |
| Key Features | Speed, Accuracy, Storage, Versatility, Diligence |
| Main Units | Input, Process, Storage, Output, Communication |
| Cycle | Input → Process → Output → Storage |
You've completed Article 1: What is a Computer?
Courage Tip: Focus on understanding the basic components and their functions. Remember the IPO cycle and key characteristics for Delhi Police exam.
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