Computer

Input and Output Devices

Class 3

🎯 Learning Objectives

Understand what input and output devices are.
Name common input devices: keyboard, mouse, microphone, scanner, webcam.
Name common output devices: monitor, printer, speakers, projector.
Explain the difference between input and output with examples.

📖 Let Us Begin!

When Ravi uses a computer, he types on the keyboard and sees words appear on the screen. When Meena records her voice, the computer listens through the microphone and plays it back through the speakers. In all these cases, information is either going INTO the computer or coming OUT of it.

Devices that send information to the computer are called input devices. Devices that bring information out from the computer are called output devices.

What is an Input Device?

An input device is any device we use to give data or instructions to the computer. Think of it as talking TO the computer.

Think about it: When you speak to a friend, you are giving them information. Similarly, when you type on a keyboard, you are giving information to the computer!

Input Device	What it does	Daily Life Example
Keyboard	Used to type letters, numbers, and symbols	Ravi types his name in a form at school
Mouse	Used to point, click, and select items on screen	Meena clicks on a game icon to open it
Microphone	Captures sound and voice	Sita speaks into the mic during an online class
Scanner	Copies a paper document into the computer	Arjun scans his drawing to send to his teacher
Webcam	Captures video and photos	Ravi uses the webcam for a video call with his grandparents in Chennai

What is an Output Device?

An output device is any device that brings information out of the computer so we can see, hear, or use it. Think of it as the computer talking back to us.

Output Device	What it does	Daily Life Example
Monitor	Displays text, images, and videos on screen	Meena watches a story on the monitor
Printer	Prints documents and pictures on paper	Sita prints her project report for school
Speakers	Produce sound — music, voices, alerts	Arjun listens to a Hindi song through the speakers
Projector	Projects the screen image on a large wall or board	The teacher uses a projector to show a map to the whole class

The Key Difference

Input vs Output — Easy Way to Remember

Input = Giving information TO the computer (you → computer)

Output = Getting information FROM the computer (computer → you)

A keyboard sends your typing to the computer — it is an INPUT device.
A monitor shows you what the computer has processed — it is an OUTPUT device.

📝 Key Words

Word	Meaning
Input device	A device used to give data or instructions to the computer
Output device	A device that brings results or information out of the computer
Keyboard	An input device with keys for typing letters and numbers
Monitor	An output device that displays information on a screen
Microphone	An input device that captures sound and voice
Printer	An output device that prints documents on paper
Scanner	An input device that copies paper documents into the computer
Projector	An output device that displays images on a large screen or wall

⭐ Key Points to Remember

Input devices send information TO the computer.
Output devices bring information FROM the computer.
Keyboard, mouse, microphone, scanner, and webcam are input devices.
Monitor, printer, speakers, and projector are output devices.
A computer needs both input and output devices to be useful.

✏️ Practice Questions

A. Fill in the Blanks

1. A is used to type letters and numbers into the computer.

2. The displays information on a screen.

3. A captures sound and voice as input.

4. A prints documents on paper.

5. Devices that give information to the computer are called devices.

B. Multiple Choice Questions

1. Which of these is an input device?

(a) Monitor(b) Printer(c) Mouse

2. Sita wants to show her project on a big screen for the whole class. Which device should she use?

(a) Scanner(b) Projector(c) Webcam

3. Which device copies a paper document into the computer?

(a) Printer(b) Speakers(c) Scanner

C. Short Answer

1. What is the difference between an input device and an output device?

2. Name two input devices and two output devices.

3. Arjun wants to talk to his friend using the computer. Which input device will he use?

Sort It Out!

Look at the list of devices below. Write each one in the correct column in your notebook.

Devices: Keyboard, Monitor, Microphone, Printer, Mouse, Speakers, Scanner, Projector, Webcam

Draw a table with two columns: Input Devices and Output Devices. Place each device in the right column.

Want to use this as a worksheet? Switch to the A4 printable view.

Learning Objectives

Understand what input and output devices are.
Name common input devices: keyboard, mouse, microphone, scanner, webcam.
Name common output devices: monitor, printer, speakers, projector.

Let Us Begin!

Devices that send information to the computer are called input devices. Devices that bring information out from the computer are called output devices. Input means giving information TO the computer. Output means getting information FROM the computer.

Input Devices

An input device is used to give data or instructions to the computer.

Input Device	What it does
Keyboard	Used to type letters, numbers, and symbols
Mouse	Used to point, click, and select items on screen
Microphone	Captures sound and voice
Scanner	Copies a paper document into the computer
Webcam	Captures video and photos

Output Devices

An output device brings information out of the computer so we can see, hear, or use it.

Output Device	What it does
Monitor	Displays text, images, and videos on screen
Printer	Prints documents and pictures on paper
Speakers	Produce sound -- music, voices, alerts
Projector	Projects the screen image on a large wall or board

Key Words

Word	Meaning
Input device	A device used to give data or instructions to the computer
Output device	A device that brings results or information out of the computer
Scanner	An input device that copies paper documents into the computer
Projector	An output device that displays images on a large screen

Key Points to Remember

Input devices send information TO the computer.
Output devices bring information FROM the computer.
Keyboard, mouse, microphone, scanner, and webcam are input devices.
Monitor, printer, speakers, and projector are output devices.
A computer needs both input and output devices to be useful.