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A1.3 · Explain the roles of common peripherals

Learn to explain the roles of common peripherals through clear examples and targeted practice.

Ontario Grade 10 Computer Science

Understanding Computers

ICS2O study topic A1.3: Explain the roles of common peripherals

A computer system is more than the computer case or laptop body. People connect devices to it to enter information, receive results, or keep information for later. These devices are commonly called peripherals. For example, when a student types a report, a keyboard sends the typed characters to the computer. The computer works with that input, and a screen shows the report. This lesson focuses on the roles of common peripherals: what each device does as part of a computer system.

What you will learn

  • Explain what a peripheral is and describe how it works with a computer.
  • Tell the difference between input, output, and storage peripherals.
  • Trace information through input, process, and output in everyday situations.
  • Choose a suitable peripheral for a stated task and explain its role.

1. What a peripheral does

A peripheral is a device that works with a computer but is not the computer’s main processing unit. Some peripherals are built into a laptop, such as its keyboard, camera, and speakers. Others connect from outside, such as a mouse, printer, or external storage drive. The word peripheral describes the device’s role in the system; it does not mean the device is unimportant.
A useful way to describe a computer task is input, process, and output. Input is information sent into the computer. Processing is the computer working with that information. Output is information or a result presented by the computer. A peripheral can provide input, present output, or store information so it can be used later.
The main computer handles processing. A peripheral usually does not replace that role. For instance, a microphone captures sound and sends it to the computer; the computer can then use the sound in an application. The microphone is an input peripheral, while the computer processes the captured information.
  • Input peripherals send information to the computer.
  • Output peripherals present information from the computer.
  • Storage peripherals keep information for later use.
  • A device’s role depends on what it does in a task.

2. Input peripherals

An input peripheral lets a person or another source provide information to a computer. A keyboard sends letters, numbers, and commands. A mouse or touchpad sends information about pointer movement and clicks. A touchscreen can both receive touch input and display output, so one device may have more than one role.
A microphone captures sound and sends it to the computer. A camera captures images or video. A scanner reads a paper image or document and sends a digital version to the computer. These devices do not all capture the same kind of information: consider whether the task involves typing, pointing, sound, a live image, or a paper original.
Input choices can affect accessibility. For example, a student who finds typing difficult might use speech input through a microphone if the computer’s available software supports it. The microphone’s role is still input: it provides sound for the computer to work with. The student should consider whether speaking is suitable for the setting and whether nearby people might hear private information.
  • Keyboard: enters typed characters and commands.
  • Mouse or touchpad: provides pointer movement and selection input.
  • Microphone: captures sound as input.
  • Camera and scanner: provide image input, in different situations.

3. Output and storage peripherals

An output peripheral presents information produced by the computer. A monitor or screen displays text, images, and other visual results. Speakers and headphones present sound. A printer produces a paper copy. The best choice depends on how the user needs to receive the result: view it, hear it, or use a printed copy.
A peripheral can also store information. An external storage drive, for example, can keep files so they can be used again or moved to another compatible computer. Storage is different from output: saving a file keeps information, while showing it on a screen presents it. Some devices may take on multiple roles, but describe the role relevant to the task.
A simple system diagram can show how these roles fit together. Arrows are labelled with the kind of information that moves; the diagram is a model, not a measurement of speed or capacity. In a typical task, input information goes to the computer, processing occurs there, and the computer sends a result to an output peripheral. A storage device can receive or provide files.
  • Monitor: displays visual output.
  • Speakers or headphones: present audio output.
  • Printer: produces printed output.
  • External storage: keeps files for later use or transfer.

4. Identify the role by following the information

When you are unsure how to classify a peripheral, follow the information in a particular task. Ask: What information enters the computer? What does the computer do with it? How does a person receive the result? Is information being kept for later? This avoids memorising a device name without understanding its role.
Practice with a shared classroom computer. A student uses a keyboard to enter a short note, the computer works with the entered characters, and the monitor displays the note. The keyboard is input, processing happens in the computer, and the monitor provides output. If the student saves the note to an external drive, that drive provides storage in this task.
A device can have more than one role. A touchscreen displays output and accepts touch input. A multifunction printer can scan a paper document into the computer and print a computer file onto paper. Explain each role in context rather than insisting that the device can only belong to one category.
  • Classify by the information moving in the task, not only by the device name.
  • Input, process, and output describe different parts of a task.
  • A device may serve more than one role.

Worked example

Typing and printing a class note

A student types a short note, checks it on screen, and prints a paper copy. Identify the roles of the peripherals and trace the information.
Typing and printing a note
typed charactersnote for displaynote for printingKeyboardComputer: processMonitor: displayPrinter: paper copy

The keyboard provides input; the computer processes it and sends results to the monitor and printer.

  1. Find the input
    The keyboard is the input peripheral because it sends the student’s typed characters into the computer.
  2. Locate processing
    The computer works with the entered characters to form the note. Processing is done by the computer, not by the keyboard or printer.
  3. Identify the outputs
    The monitor displays the note as visual output. The printer produces a paper copy, which is also output.
Answer: Keyboard: input. Computer: processing. Monitor: visual output. Printer: printed output.
Check: The printer is not the input device here: information travels from the computer to the printer to produce the paper copy.

Worked example

Joining a voice conversation

A student uses a computer for a voice conversation. The computer receives the student’s voice and plays the other person’s voice. Identify the peripherals’ roles.
Audio conversation
student's voicereceived voiceMicrophone: capture sounComputer: process audioHeadphones or speakers

Sound enters through a microphone; audio output is presented through speakers or headphones.

  1. Trace the student’s voice
    The microphone captures the student’s sound and sends it into the computer, so it is an input peripheral.
  2. Trace the received voice
    The computer processes the conversation information. Speakers or headphones present the other person’s voice, so they provide audio output.
  3. Consider the setting
    Headphones can let the student hear the conversation without playing it aloud. The microphone and headphones still have different roles: input and output.
Answer: Microphone: audio input. Computer: processing. Speakers or headphones: audio output.
Check: The microphone does not play the other person’s voice; it captures sound entering the computer.

Worked example

Scanning and saving a paper handout

A student scans a paper handout and saves the digital version to an external storage drive. Identify the role of each peripheral.
Scanning and saving a handout
scanned imagesaved digital fileScanner: read paperComputer: processExternal drive: store fi

The scanner supplies image input; the computer handles it and saves a file to the external drive.

  1. Convert the paper information
    The scanner reads the paper handout and sends an image or document into the computer. In this task, it is an input peripheral.
  2. Work with the digital information
    The computer receives and works with the scanned information. The scanner provides input; it does not itself perform the computer’s processing role.
  3. Keep the file
    The external storage drive keeps the digital file so it can be used later. Its role in this task is storage, not printed output.
Answer: Scanner: image or document input. Computer: processing. External drive: storage.
Check: Saving a file to a drive is storage. It is not the same as printing the file or displaying it on a screen.

Common mistakes and how to avoid them

Calling every device connected to a computer an input device.
Correction: Ask which way information moves in the task. A printer presents output; a keyboard supplies input.
Treating processing as the role of the keyboard, scanner, or monitor.
Correction: These peripherals provide input or output. The computer processes the information.
Assuming each device can have only one role.
Correction: Describe its role in the particular task. A touchscreen can accept touch input and display output.
Confusing storage with output.
Correction: Storage keeps information for later. Output presents information, such as showing it on a screen or printing it.

Lesson summary

  • Peripherals work with a computer as input, output, or storage devices.
  • Input enters information; the computer processes it; output presents a result.
  • Common input peripherals include keyboards, mice, microphones, cameras, and scanners.
  • Common output peripherals include monitors, speakers, headphones, and printers.
  • External drives can store information for later use.
  • Describe a peripheral’s role by tracing information through the task.

Check your understanding

Question 1

A student uses a mouse to select a file. What is the mouse doing?
  1. Providing input to the computer
  2. Displaying visual output
  3. Storing the file for later
  4. Printing the file
Show answer and explanation
Providing input to the computer
The mouse sends pointer movement and selection information into the computer, so it provides input.

Question 2

Which device presents computer sound as audio output?
  1. Scanner
  2. Microphone
  3. Headphones
  4. Keyboard
Show answer and explanation
Headphones
Headphones present sound from the computer. A microphone captures sound as input.

Question 3

A student saves a document to an external drive. What is the drive’s role in this task?
  1. Input
  2. Processing
  3. Storage
  4. Printed output
Show answer and explanation
Storage
The drive keeps the document so it can be used later, which is storage.

Key terms

Peripheral
A device that works with a computer, such as a keyboard, monitor, printer, or external drive.
Input
Information sent into a computer.
Processing
Work the computer does with information.
Output
Information or a result presented by the computer.
Storage
Keeping information so it can be used later.

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About this lesson and its review

Published by DoAssignment. This reviewed lesson follows Ontario Grade 10 Computer Science (ICS2O), expectation A1.3. 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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