Outputs (AQA GCSE Design & Technology): Revision Note
Exam code: 8552
Buzzers
What is a buzzer?
A buzzer is an output component which creates sound from electrical flow
Buzzers are used for warnings and getting attention
Pitch and volume can be adjusted by varying the electricity
Buzzers can only produce a single type of sound (unlike speakers)
Example uses of buzzers
Smoke alarms (sound on smoke detection)
Electronic toys and games (interactive sound alerts)
Speakers
What is a speaker?
A speaker is an output component which creates sound waves from electrical signals
Speakers can create voice, music and other complex sounds
Speakers require electrical signals to produce complex audio
Speakers contain a diaphragm, magnets and a metal coil
Example uses of speakers
Headphones (music and voice from mobile devices)
Car sat nav systems (spoken directions)
Lamps
What is a lamp?
A lamp is an output component which creates light from electrical signals
Brightness can be adjusted via inputs or other components
Types of lamp include: LED, incandescent and halogen
Simple electrical signals can enable complex lighting effects with a microcontroller
Example uses of lamps
Torches and handheld lights (on/off or dimmable)
Room lighting (switch or resistor control)
Examiner Tips and Tricks
Remember that outputs are the parts of a system that do something — they produce sound, light, movement etc.
In the exam, you may be given a scenario and asked to identify suitable inputs and outputs. Always think about what the system needs to detect (input) and what it needs to do (output).
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