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A1.2 · Computer Hardware: Storage, RAM and CPU

Learn to explain what internal computer components do through clear examples and targeted practice.

Ontario Grade 10 Computer Science

Understanding Computers

Ontario Grade 10 Computer Studies — study topic A1.2

When you open a saved photo, several parts inside the computer help make that task possible. The student’s choice is input: information or an instruction provided to the computer. The internal components process information, meaning they carry out work on it. The image shown on a screen is output, or a result made available to a person or another device. This lesson focuses on what the internal components do. The input and output are included as context so you can explain how those components support a task. Diagrams are simplified explanations, not measurements of a real computer.

What you will learn

Explain the roles of common internal computer components.
Describe how internal components work together during a familiar computer task.
Distinguish temporary working memory from storage that keeps files for later.

1. The motherboard connects components

The motherboard is the main circuit board inside a computer. Internal components connect to it, and its pathways help them communicate. The exact arrangement varies between computers, but the motherboard’s basic role is to connect parts so they can work together.

Imagine opening a saved photo. Information from storage must be made available to components doing current work. The motherboard helps provide connections for that communication. It does not replace the CPU, RAM, or storage, and it does not perform all their jobs.

A useful way to explain any component is to name its job rather than simply say that it is inside the computer. For example, say that the motherboard connects components, not that it processes every file.

The motherboard connects internal components and supports communication.
Connected components still have different jobs.

2. The CPU and graphics components help process information

The central processing unit, usually called the CPU, carries out instructions. It performs calculations and simple comparisons that programs need. When a person opens a photo, the CPU carries out instructions involved in the task.

A graphics processing unit, or GPU, helps with work related to creating images and video for display. Some computers have a separate GPU; others include graphics-processing capability as part of another component. In either case, graphics processing supports visual work, while the CPU carries out instructions more generally.

Processing and storage are different. The CPU carries out instructions; an SSD or HDD keeps files and programs for later. The CPU may work with information that has been brought from storage, but it is not where the saved photo is kept.

The CPU carries out instructions and calculations.
A GPU helps with graphics-related work.
Processing information is different from keeping files for later.

3. RAM is temporary working memory; storage keeps files

Random access memory, usually called RAM or memory, holds information and instructions that a computer is using for current work. When a photo is open, some information needed for that work can be held in RAM. RAM is temporary working space; it is not intended to keep its contents saved when the computer is turned off.

Storage keeps files and programs for later use. A solid-state drive (SSD) and a hard disk drive (HDD) are two kinds of storage. A saved photo can remain on storage when the computer is turned off, unless it is deleted or the storage fails.

A work surface and a storage cabinet make a helpful comparison. RAM is like a work surface holding materials in use now; storage is like a cabinet holding materials for later. The comparison is not exact, but it highlights their different roles. When a person opens a saved file, storage supplies information and RAM holds information needed for current work.

If a person changes a file and wants those changes available later, they need to save the updated file to storage. Do not assume that information held only as current work in RAM is a saved copy.

RAM holds information for current work and is temporary.
An SSD or HDD keeps saved files and programs for later use.
Saving changes places an updated file on storage.

4. Power and cooling support operation

A desktop computer’s power supply provides usable electrical power to its components. A laptop has a different arrangement that includes a battery, but its components also need electrical power.

Components produce heat while working. Fans and other heat-dissipating parts help move heat away from components. A fan does not process a photo or save a document; it helps manage heat.

These roles help explain why several internal components may be relevant to one task. The CPU carries out instructions, RAM holds information for current work, storage keeps saved files, the motherboard connects parts, the power supply provides power, and cooling parts help move heat away. Identify the component’s job before describing how it supports the task.

A desktop power supply provides usable electrical power.
Cooling parts help move heat away from components.
Support components have different jobs from processing and storage components.

Worked example

Opening a saved photo

A student selects a photo saved on an SSD and views it on a monitor. Identify the input, processing, and output, then explain the roles of relevant internal components.

Internal components supporting a photo task

A simplified view of component roles. The monitor is context for the output, not an internal component.

Identify the input
The student’s selection is input because it tells the computer which photo to open. The photo’s saved information is kept on the SSD.
Explain the internal work
The SSD supplies the saved photo information. RAM holds information needed for current work. The CPU carries out instructions, and graphics-processing capability helps with preparing images for display. The motherboard provides connections that support communication among components.
Name the output
The image shown on the monitor is output. The monitor is outside the computer’s case; here it is context for explaining what the internal components help accomplish.

Answer: Input: the student’s selection. Processing: storage supplies the file, RAM holds information for current work, the CPU carries out instructions, and graphics-processing capability helps with image work. Output: the photo appears on the monitor.

Check: The SSD keeps the saved photo for later; RAM holds information being used for current work.

Worked example

Editing and saving a document

A student opens a document, edits it, saves it, and later turns off the computer. Explain the roles of RAM and storage at each stage.

Working on and saving a document

The diagram emphasizes the different roles of RAM, the CPU, and storage.

Open the document
The document is retrieved from storage. RAM holds information the computer needs while the document is open, and the CPU carries out instructions for working with it.
Save the edits
Saving writes the updated document to storage, such as an SSD or HDD. RAM can continue to hold information used during current work.
Turn off the computer
RAM is temporary, so the student should not expect an unsaved change held only there to remain available. If the updated document was saved successfully and storage is working, its saved copy remains on storage.

Answer: RAM holds information for current work; storage keeps the saved document for later. Save changes to storage before turning off the computer if you want them available later.

Check: An unsaved change held only as current work should not be treated as a saved copy on storage.

Worked example

Explaining warm air from a computer fan

During a long task, a student notices warm air coming from a desktop computer’s fan. Explain which internal components are involved and what they do. Treat this as a hypothetical situation, not a measurement of a particular computer.

Components supporting a desktop computer

A simplified role map. The power supply provides power, the motherboard connects parts, and the fan helps move heat away.

Connect the task to processing
The CPU may be carrying out instructions for the task. Active components produce heat while working, but the CPU’s role is instruction work, not cooling.
Explain the fan
The fan moves air to help carry heat away from internal components. Warm air is consistent with heat being moved, but this observation alone does not show that the computer has a fault.
Describe other supporting components
The desktop power supply provides usable electrical power. The motherboard connects components and supports their communication. These roles differ from the CPU’s processing role and the fan’s cooling role.

Answer: The CPU carries out instructions and produces heat while working. The fan helps move heat away. The power supply provides electrical power, and the motherboard connects components. Warm air alone does not establish that the computer has a problem.

Check: The fan helps with cooling; it does not process instructions or save files.

Common mistakes and how to avoid them

Saying that RAM permanently saves a document.

Correction: RAM holds information for current work. Save a document to storage, such as an SSD or HDD, to keep it for later.

Saying that the motherboard carries out every instruction.

Correction: The motherboard connects components and supports communication. The CPU carries out instructions.

Assuming that a fan processes information because it is inside the computer.

Correction: The fan helps move heat away. A component’s location does not determine its job.

Treating the CPU and graphics-processing capability as identical.

Correction: The CPU carries out instructions generally; graphics-processing capability helps with image and video work.

Lesson summary

Input is information or an instruction provided to a computer; processing is work done with information; output is a result made available.
The motherboard connects internal components and supports communication.
The CPU carries out instructions; graphics-processing capability helps with graphics-related work.
RAM holds information for current work, while an SSD or HDD keeps saved files for later.
A desktop power supply provides usable electrical power, and cooling parts help move heat away.

Check your understanding

Question 1

Which component mainly carries out program instructions?

The CPU
The fan
The SSD
The power supply

Show answer and explanation

The CPU

The CPU carries out instructions. The fan helps manage heat, the SSD stores files, and the power supply provides electrical power.

Question 2

A student edits a saved file and wants the changes to remain available after turning off the computer. What should the student do?

Save the updated file to storage.
Leave the changes only in RAM.
Wait for the fan to save the file.
Disconnect the motherboard.

Show answer and explanation

Save the updated file to storage.

Storage keeps saved files for later. RAM is temporary working memory, and the fan and motherboard do not save documents.

Question 3

What is the motherboard’s main role in this lesson?

To connect components and support communication between them
To keep all files permanently
To cool every component by itself
To display images directly to the student

Show answer and explanation

To connect components and support communication between them

The motherboard provides connections and pathways that support communication. It does not replace storage, cooling, or the display.

Key terms

CPU: The central processing unit; it carries out instructions and calculations.
GPU: A graphics processing unit; it helps with work related to creating images and video for display.
Motherboard: The main circuit board that connects components and supports their communication.
RAM: Temporary working memory that holds information a computer is using now.
Storage: A place, such as an SSD or HDD, where files and programs are kept for later use.
Power supply: A desktop computer component that provides usable electrical power to its parts.

Continue through ICS2O

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About this lesson and its review

Published by DoAssignment. This reviewed lesson follows Ontario Grade 10 Computer Science (ICS2O), expectation A1.2. It is a study resource, not an official curriculum publication.

Before publication, content is checked for structure, mathematical or chemical notation, calculations, course boundaries, and readability. Errors can still occur, so corrections are welcomed.

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