Definition of Computer Processing – JSS1 Computer Studies Lesson Note (Third Term)

Computer processing is the work that a computer does to turn the information we give it (input) into the results we want (output). It is like the thinking part of the computer. Just as our brain processes information to help us make decisions, the computer processes data to solve problems and perform tasks.

Behavioural objectives

By the end of the lesson, students should be able to:

• Define computer processing.
• Name the three main parts of computer processing: input, processing and output.
• Describe the processing cycle.
• State the roles of the CPU, RAM, storage devices and software in processing.
• Name and describe the types of processing.
• Give examples of computer processing in real life.

What is the basic idea of processing?

Think about making a sandwich. You start with bread, butter and cheese (the input). You do some work: spreading the butter, placing the cheese and cutting the sandwich (the processing). Then you end up with a ready-to-eat sandwich (the output). Computer processing works in a similar way.

What are the main parts of computer processing?

Input

Input is the information that goes into the computer. It can come from many sources:

• Typing on a keyboard
• Clicking or moving a mouse
• Touching a screen
• Speaking into a microphone
• Scanning a picture
• Reading from a storage device like a USB drive
• Getting data from the internet
• Using a camera or other sensor

The computer needs this input before it can start processing.

Processing

Processing is when the computer works on the input data. This happens inside the computer’s brain, called the Central Processing Unit (CPU). During processing, the computer:

• Follows instructions from programs
• Does calculations and maths
• Compares different pieces of information
• Makes decisions based on rules
• Organises data
• Transforms data from one form to another
• Checks for errors
• Prepares data to be shown as output

Output

Output is the result that comes out of the computer after processing. Output can be:

• Words and pictures on the screen
• Printed documents on paper
• Sounds from speakers
• Videos
• Information saved on storage devices
• Messages sent to other computers
• Controls sent to other machines

What is the processing cycle?

Computer processing usually follows a cycle:

1. Input is received.
2. Processing happens.
3. Output is produced.
4. The cycle starts again with new input.

This cycle can happen millions or billions of times every second in modern computers.

What makes processing happen?

Several important parts work together to make computer processing happen.

CPU (Central Processing Unit)

The CPU is the main processing part of the computer. It is like the computer’s brain. The CPU:

• Follows the instructions in computer programs
• Does the actual processing work
• Makes calculations and decisions
• Controls the flow of data inside the computer
• Works extremely fast

CPUs are measured by their speed (how fast they work) in GHz (gigahertz) and by how many cores they have (each core is like a separate small CPU that can work on different tasks).

RAM (Random Access Memory)

RAM is the computer’s short-term memory. During processing:

• Data that is being worked on is stored in RAM.
• Programs that are running are loaded into RAM.
• RAM works very quickly so the CPU can access data fast.
• RAM is emptied when the computer is turned off.

More RAM helps a computer process more things at once.

Storage devices

Storage devices keep data for a long time, even when the computer is turned off:

• Hard drives store most of your files.
• Solid state drives (SSDs) are faster storage devices.
• During processing, data moves between storage and RAM.

Software (programs)

Software provides the instructions for processing:

• The operating system (like Windows, macOS or Android) controls basic processing.
• Application programs (like word processors, games or web browsers) tell the computer how to do specific tasks.
• Each program contains step-by-step instructions for the CPU to follow.

What are the types of processing?

Computers can process data in different ways.

Batch processing

• Many items are collected and processed all at once.
• Example: processing all the grades for a school at the end of the term.
• It works well for tasks that don’t need immediate results.

Real-time processing

• Data is processed immediately as it arrives.
• Example: video calls, where you see and hear the other person right away.
• It is important for things that can’t wait.

Transaction processing

• Each transaction (like a bank deposit) is processed completely before the next one.
• Example: ATM machines processing one customer at a time.
• It is good for financial and business operations.

Distributed processing

• The processing work is shared among many computers connected together.
• Example: big internet services like search engines.
• It helps handle very large processing jobs.

Parallel processing

• Many parts of one task are processed at the same time.
• Example: modern video games using multiple CPU cores.
• It makes processing faster for complex tasks.

What are some examples of computer processing in real life?

In school

• A student types an essay (input).
• The word processor checks spelling and formats the text (processing).
• The finished document appears on screen or is printed (output).

In a store

• A cashier scans items at checkout (input).
• The computer calculates the total price and updates inventory (processing).
• A receipt is printed and the inventory database is updated (output).

In a weather forecast

• Weather stations collect temperature, wind and pressure data (input).
• Powerful computers run weather models on this data (processing).
• Maps and forecasts are created to show predicted weather (output).

In a video game

• The player presses buttons on a controller (input).
• The game calculates new positions for characters and updates the game world (processing).
• The updated game scene appears on the screen (output).

How fast is computer processing?

Computer processing happens very fast:

• Modern CPUs can do billions of calculations per second.
• This speed is measured in gigahertz (GHz).
• Faster processing means computers can do more work in less time.
• Complex tasks like video editing need faster processing.
• Simple tasks like writing emails need less processing power.

Why is processing power important?

Having good processing power matters because:

• Faster processing means less waiting time.
• More powerful processing can handle bigger tasks.
• Better processing can make graphics look nicer.
• Advanced processing enables artificial intelligence and machine learning.
• Multiple processing cores let computers do many things at once.

What are the common processing problems?

Sometimes processing doesn’t work well:

• The computer might run slowly if too many programs are open.
• A program might freeze if it has a problem during processing.
• Processing errors can cause programs to crash or stop working.
• A computer might get hot if it is processing too much at once.
• Outdated hardware might not be able to process new software well.

Evaluation

1. What is computer processing?
2. Name the three main parts of computer processing.
3. List four ways of putting input into a computer.
4. State the difference between RAM and a storage device.
5. Describe batch processing and give one example.

Assignment

1. Choose one example from the note (school, store, weather forecast or video game). Write down its input, processing and output.
2. Write two differences between batch processing and real-time processing.
3. List three problems that can happen during computer processing.