Electronics - GCSE DT Flashcards
What is a systems diagram?
A schematic that shows the different stages of a system or process
What does a open loop system have/ doesn’t have?
It doesn’t have feedback (e.g. light switch)
What does a closed loop system have/ doesn’t have?
It has feedback (e.g. heating system)
What is the meaning of physical quantity for input transducers?
Anything that can be measured. (e.g. light, time…)
What is a LDR?
A resistor that changes the resistance depending on how much light comes in.
What is a photodiode?
Current flows in one direction, when there isn’t light it’s an insulator, with light current flows.
What is a phototransistor?
A switch which turns on with light.
What is a lamp?
Current can flow in any direction, insufficient as it gets hot
What is a LED?
Must go in a certain way, different types
What is a microphone?
Detects sound
What is a heating element?
Uses resistance to make heat, requires large amount of current
What is a fan?
Used for cooling, effectively a motor
What is an output transducer?
Converts electrical signal into a physical quantity
Why do we need an output transducer?
We can’t see what happens within the circuit so the information is translated into something we can use
Why are output drivers needed?
To increase the current so an output works
