Understanding Input Devices

Active learning builds lasting understanding in Year 3 because children grasp input devices best when they physically become part of the process. Moving from passive observation to active participation helps students internalize the ‘cause and effect’ relationship between human actions and computer responses.

• Year 3
• Computing
• 3 activities
• 15 min–30 min

Learning Objectives

1. Identify at least three different input devices and explain their function.
2. Compare how pressing a key on a keyboard and clicking a mouse send different signals to a computer.
3. Explain how a specific input action, like a mouse click, triggers a predictable software response.
4. Classify given actions as either input or output events.
5. Demonstrate how a sequence of inputs can create a desired output in a simple game scenario.

Simulation Game

⏱ 25 min·Small Groups

Simulation Game: The Human Computer

One student is the 'Processor', one is the 'Input' (holding a keyboard drawing), and one is the 'Output' (holding a 'Screen' whiteboard). When the Input 'presses' a key, the Processor tells the Output what to draw.

Prepare & details

Explain how the computer knows which key you have pressed.

Facilitation Tip: During the Human Computer activity, physically walk through the loop so students see their role as the ‘input’ and the computer’s role as the ‘output’ processor.

Setup: Flexible space for group stations

Materials: Role cards with goals/resources, Game currency or tokens, Round tracker

• Apply
• Analyze
• Evaluate
• Create
• Social Awareness
• Decision-Making

Inquiry Circle

⏱ 30 min·Small Groups

Inquiry Circle: Input/Output Scavenger Hunt

Groups explore the classroom or a set of devices (tablets, calculators, interactive boards) to identify every input and output they can find, recording them in a T-chart.

Prepare & details

Compare the different ways a human can give a command to a machine.

Facilitation Tip: For the scavenger hunt, provide clipboards and clear categories to keep students focused on distinguishing input from output in real devices.

Setup: Groups at tables with access to source materials

Materials: Source material collection, Inquiry cycle worksheet, Question generation protocol, Findings presentation template

• Analyze
• Evaluate
• Create
• Self-Management
• Self-Awareness

Think-Pair-Share

⏱ 15 min·Pairs

Think-Pair-Share: Future Inputs

Ask students to imagine a computer with no keyboard or mouse. Partners brainstorm new ways we could 'talk' to a computer (e.g., blinking, thinking, dancing) and what the 'output' would be.

Prepare & details

Predict whether a computer can ever act without an input from a human or another machine.

Facilitation Tip: Use Think-Pair-Share to give every student time to rehearse explanations before sharing with the class, reducing anxiety and building clarity.

Setup: Standard classroom seating; students turn to a neighbor

Materials: Discussion prompt (projected or printed), Optional: recording sheet for pairs

• Understand
• Apply
• Analyze
• Self-Awareness
• Relationship Skills

Teaching This Topic

Teach this topic by modeling the input-output chain with your own body first. Avoid abstract explanations; instead, use concrete examples like pressing a key or speaking into a microphone. Research shows that children learn computer science concepts best when they connect them to physical actions they can see and repeat. Emphasize that input devices do not ‘think’—they simply carry signals to the computer, which then produces an output.

What to Expect

By the end of these activities, students should confidently identify input devices, explain why they are inputs, and describe at least one command they can give using each device. They should also articulate the sequence from input to output in simple terms.

Watch Out for These Misconceptions

Common Misconception

During the Human Computer activity, watch for students who label the screen as an input because they touch it.

What to Teach Instead

Use the activity setup to point out that the screen shows output (the ‘computer’s response’), while the touch is the input. Ask students to separate the two roles by naming the screen as the output and their touch as the input.

Common Misconception

During the Input/Output Scavenger Hunt, watch for students who say computers can think for themselves.

What to Teach Instead

Refer back to the scavenger hunt items. Ask students to find devices that only respond to human actions, like a keyboard or microphone, to reinforce that computers need input to do anything.

Assessment Ideas

Quick Check

After the Input/Output Scavenger Hunt, present images of devices and ask students to sort them into input and output groups. Then, ask one student to explain why they placed a touchscreen in the input group, listening for the separation of the ‘touch’ as input and the ‘image’ as output.

Discussion Prompt

During the Think-Pair-Share activity, pose the scenario: ‘You press the space bar to jump in a game.’ Ask students to identify the input, the signal, and possible outputs. Listen for explanations that start with the physical action and end with the computer’s response.

Exit Ticket

After the Human Computer activity, give each student a slip of paper. Ask them to write one input device they used during the activity and describe one command they gave to the computer using that device. Use these to check if students can articulate the input-output relationship.

Extensions & Scaffolding

• Challenge early finishers to design a new input device and explain how it would send signals to a computer.
• Scaffolding: Provide picture cards of devices to sort for students who need visual support.
• Deeper exploration: Ask students to research how an older input device, like a floppy disk drive, worked as an input to a computer.

Key Vocabulary

Input Device	A piece of hardware that sends data or signals to a computer, allowing a user to interact with it. Examples include keyboards, mice, and microphones.
Signal	An electrical message sent from an input device to the computer's processor. This message tells the computer what action has occurred.
Command	An instruction given to a computer, usually through an input device, that tells it to perform a specific task.
Event	Something that happens when an input device is used, such as a key press or a mouse click. The computer detects these events.