Practice Flashcards
Flip to reveal answersHow should output devices be grouped?
Track your progress — Sign up free to save your progress and get smart review reminders based on spaced repetition.
All 4 Flashcards — Output devices
Sign up free to track progress and get spaced-repetition review schedules.
Question
How should output devices be grouped?
Answer
By the sense they reach: seen (LED, lamp, LCD, braille display), heard (buzzer, speaker, headphones), felt (haptic), done (motor, relay), kept (printer, plotter).
Question
When is sound the right output, and when is it wrong?
Answer
Right when the user is not looking — every alarm depends on it. Wrong in a shared or quiet place, because it reaches everyone, and useless to a deaf user.
Question
Why can a chip pin not drive a motor or a lamp?
Answer
A pin supplies a few tens of milliamps; a motor needs hundreds and a mains load needs amps. The pin switches a transistor or relay, which carries the load current from the supply.
Question
What must be fitted across a relay coil or motor, and why?
Answer
A flyback diode. When the current stops, the collapsing magnetic field produces a reverse voltage spike that would destroy the switching transistor.
Read the notes
Full study notes for Output devices
Topic 3.4 hub
Electronic systems
More from Topic 3.4
All flashcards in this topic
Design Technology exam skills
Paper structures & tips
Track your progress with spaced repetition
Sign up free — Aimnova tells you exactly which cards to review and when, so you remember everything before your IB exam.
Start Free