Computing · Year 3 · Events and Actions: Interactive Games · Summer Term

Understanding Input Devices

Exploring how physical actions like clicking or pressing keys interact with software.

• National Curriculum Attainment Targets
• KS2: Computing - Computer Systems
• KS2: Computing - Programming

About This Topic

Input and output are the two halves of every digital interaction. In Year 3, students move from just using devices to understanding the 'cause and effect' relationship between them. An 'input' is a signal sent to the computer (like a key press, a mouse click, or a voice command), and an 'output' is what the computer does in response (like showing an image, playing a sound, or moving a motor).

This topic is a core part of the KS2 Computer Systems and Programming targets. It helps students understand that computers don't have 'minds of their own', they are reactive machines. This topic comes alive when students can physically model the patterns of input and output through 'Human Computer' games where they act out the internal processing of a device.

Key Questions

1. Explain how the computer knows which key you have pressed.
2. Compare the different ways a human can give a command to a machine.
3. Predict whether a computer can ever act without an input from a human or another machine.

Learning Objectives

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

Before You Start

Basic Computer Operation

Why: Students need familiarity with turning on a computer and using a mouse and keyboard at a basic level to understand how these devices function as inputs.

Following Simple Instructions

Why: The concept of giving commands to a computer is analogous to following instructions, a skill developed in earlier years.

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.

Watch Out for These Misconceptions

Common Misconception

The screen is an input because I touch it.

What to Teach Instead

This is a great 'modern' misconception! Explain that a touchscreen is actually two things in one: a sensor that takes input and a screen that shows output. Separating the 'touch' from the 'image' helps clarify the roles.

Common Misconception

Computers can think for themselves.

What to Teach Instead

Emphasize that without an input (even if it's a timer or a sensor), a computer does nothing. It is a 'waiter' waiting for an order. The 'Human Computer' activity perfectly demonstrates this dependency.

Active Learning Ideas

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.

25 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.

30 min·Small Groups

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.

15 min·Pairs

Real-World Connections

• Video game designers at studios like Rockstar Games use a variety of input devices, including specialized controllers and motion capture suits, to create interactive game worlds. Players then use standard controllers or keyboards to send input signals that drive character actions.
• Roboticists developing assistive robots for hospitals use touch screens and voice recognition systems as input devices. These allow medical staff to command the robot, directing it to deliver medication or transport samples, demonstrating how inputs control complex machinery.

Assessment Ideas

Quick Check

Present students with images of various devices (keyboard, mouse, screen, speaker, microphone). Ask them to sort the devices into two groups: 'Input' and 'Output'. Then, ask them to explain why they placed one specific device in the 'Input' group.

Discussion Prompt

Pose the question: 'Imagine you are playing a game and press the space bar. What is the input? What is the signal? What could be the output?' Guide students to articulate the chain of events from their physical action to the computer's response.

Exit Ticket

Give each student a slip of paper. Ask them to write down one input device they used today and describe one command they gave to the computer using that device. Collect these to check for understanding of the input-output relationship.

Frequently Asked Questions

What are the most common inputs for Year 3 to know?

Keyboard, mouse, touchscreen, and microphone are the essentials. You can also introduce sensors (like a camera or a tilt sensor) to show that inputs don't always look like buttons.

How can active learning help students understand input/output?

Active learning, like the 'Human Computer' simulation, breaks down the 'black box' of technology. By physically separating the roles of input, processor, and output, students see the logical flow of data. It transforms a complex electronic process into a simple, visible sequence of human actions, making the 'cause and effect' relationship clear.

Is a printer an input or an output?

It's an output! It takes information *from* the computer and puts it *out* into the physical world as a piece of paper. If it's a scanner too, then it's both!

Why do we teach this in Year 3?

It's the foundation for understanding 'Events' in programming. To write a game, you need to know that 'When Key Pressed' (Input) leads to 'Move Sprite' (Output). It links hardware to software.