Inputs and outputs — Computing, 7–10
A computer receives information, works with it and gives something back. Recognising inputs and outputs helps children understand how apps, machines and games respond to what people do.
Computers receive and respond
An input is something that enters a computer, such as a key press, a voice or a touch. An output is what the computer gives back, such as a picture, a sound or a movement. Between them, the computer processes the information and decides what response to produce.
Why separate input and output?
People and machines need a clear way to communicate. If a program knows which information is coming in and which result should go out, it can connect a button to an action or a sensor to a warning. This idea solves the problem of making a machine react predictably instead of merely doing hidden calculations.
A pedestrian crossing button
First, a person presses the button: that press is the input. Next, the controller receives the signal and checks that it is the correct button. Then it changes the traffic lights and may make a beeping sound; those lights and sounds are outputs. The system turns one small action into a safer crossing.
The screen is not the whole computer
It is reasonable to call the screen “the computer”, because it is the part we notice most. But a screen is usually an output device: it shows a result, while the processor works elsewhere and a keyboard, camera or microphone supplies input. A tablet may combine several parts in one case, but their jobs are still different.
Machines that listen and act
Voice assistants use a microphone as input and a speaker as output. A washing machine takes button presses and water-level readings, then shows a time or starts a motor. Seeing these as input, processing and output helps explain how everyday devices can respond without a person controlling every tiny step.
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