Fundamentals of Computer

The use of computers in the present day has been a crucial aspect of life. Computers are utilised in every aspect of education and business, as well as communication and research. In order to know how computers operate, one should study hardware, software, input and output, memory, storage devices, fundamentals of information technology (IT) and number systems.

Hardware

Hardware includes those tangible components of a computer which are observable and physical.

Examples include:

• Monitor
• Keyboard
• Mouse
• CPU
• Printer
• Hard Disk

Hardware has four significant functions:

• Input
• Processing
• Output
• Storage

The brain of the computer is referred to as the CPU (Central Processing Unit), as it processes the instructions and manages all activities.

Software

Software refers to a collection of computer instructions or programs that direct the computer on what to do. It is impossible to touch it, yet it takes over the hardware.

There are two main types:

1. System Software

Regulates the computer functions.

Example: Operating System

2. Application Software

Designed for specific tasks

Example: Media player, web browser, MS Office.

Software and hardware work together to complete tasks.

Input and Output Devices

Input Devices

These are devices where data is typed into the computer.

Examples:

• Keyboard
• Mouse
• Scanner
• Microphone
• Webcam

Output Devices

These instruments show the result of input.

Examples:

• Monitor
• Printer
• Speakers
• Headphones

The input-process-output cycle is used to explain the working of a computer.

Memory and Storage Devices

Data and instructions are stored in memory and storage.

Memory

Memory is a storage of data in the short run or the long run.

1. RAM (Random Access Memory)

• Temporary memory
• Memory programs currently use
• Data is lost when the power is off

2. ROM (Read Only Memory)

• Permanent memory
• Stores boot instructions

Storage Devices

Data is stored in the storage devices permanently.

Examples:

• Hard Disk/SSD
• External Hard Drive
• Pen Drive
• Memory Card
• Cloud Storage

Storage devices safely save the data even when the system is off.

Fundamentals of Information Technology (IT)

Information Technology (IT) is the use of computers and communication systems to manage information.

IT is used in:

• Education
• Banking
• Healthcare
• Business
• Government services

IT enables:

• Data processing
• Online communication
• Digital services
• Cloud computing

IT has made a significant contribution to the digital transformation.

Number System

Computers have number systems, which represent data.

1. Decimal Number System (Base 10)

Uses digits 0-9
Used in daily life

2. Binary Number System (Base 2)

Uses only 0 and 1
Internal computer use

3. Octal Number System (Base 8)

Uses digits 0-7

4. Hexadecimal Number System (Base 16)

Uses digits 0-9 and letters A-F

Binary to Decimal Conversion

Example: (1011)₂

1× 2³ + 0 × 2² + 1 × 2¹ + 1 × 2⁰
= 8 + 0 + 2 + 1
= 11

So, (1011)₂ = (11)₁₀

Decimal to Binary Conversion

Example: 13

Divide repeatedly by 2:

13 ÷ 2 = 6 remainder 1
6 ÷ 2 = 3 remainder 0
3 ÷ 2 = 1 remainder 1
1 ÷ 2 = 0 remainder 1

Reading from bottom to top – 1101

So, (13)₁₀ = (1101)₂

Quiz For Fundamentals of Computers

1. When a student opens up a computer, the system then loads up the operating system automatically. In what kind of memory are the instructions needed to go through this startup process?

A) RAM
B) ROM
C) Cache
D) Virtual Memory

Answer: B) ROM

2. What is the correct sequence of the following in relation to the input-process-output cycle of a computer system?

A) CPU - Keyboard - Monitor
B) Keyboard - CPU - Monitor
C) Monitor - CPU - Keyboard
D) CPU - Monitor - Keyboard

Answer: B) Keyboard - CPU - Monitor.

3. Using MS Word, a computer user types a document and stores it within a pen drive. What type of software and storage is it?

A) System software and primary memory.
B) Secondary storage and application software.
C) Utility software and RAM
D) Firmware and cache memory

Answer: B) Secondary storage and application software.

4. What are the possible devices that can serve as both input and output?

A) Printer
B) Scanner
C) Touchscreen
D) Speaker

Answer: C) Touchscreen

5. What number system does the best job of representing binary data in computers?

A) Decimal
B) Octal
C) Hexadecimal
D) Roman

Answer: C) Hexadecimal

6. Change the binary number (1101)₂ to decimal.

A) 11
B) 12
C) 13
D) 14

Answer: C) 13

7. Which of the statements below accurately differentiates between RAM and ROM?

A) RAM is temporary and ROM is permanent.
B) RAM will lose the information when the power is switched off, whereas ROM will keep the information.
C) Boot instructions are in RAM permanently.
D) ROM is faster than RAM

Answer: B) RAM will lose the information when the power is switched off, whereas ROM will keep the information.

8. There are thousands of student records that are kept by a school database. The hardware part that mostly executes the instructions and processes the data is the

A) Hard Disk
B) CPU
C) Monitor
D) Scanner

Answer: B) CPU

9. Given that 25 in decimal is converted into binary, what will the result be?

A) 11001
B) 10101
C) 11101
D) 10011

Answer: A) 11001

10. In what ways does information technology (IT) best depict the following scenarios?

A) Arithmetic with a calculator.
B) Sharing and keeping medical records by use of digital hospital systems.
C) typing a document and forgetting to save it.
D) Printer use without a computer.

Answer: B) Sharing and keeping medical records by use of digital hospital systems.