Looped Systems
Design & Technology: AQA GCSE, topic 1.4.4
Open Looped and Closed Looped Systems
Electronic systems can be open looped or closed looped.
Open looped systems
- The input controls the output.
- There is no feedback.
Open looped
Example: toaster
- Example a toaster:
- There is no feedback.
- The bread will pop up after a set time even if the toast is not brown enough.
Closed looped systems
- The input controls the output.
- There is a feedback loop which enables the system to make a decision.
- This usually uses a sensor.
Closed loop
Example: kettle
- Example a kettle:
- There is feedback.
- A sensor will continue to detect the heat and input into the process until the water reaches a certain temperature when the kettle will turn off.
Test yourself on Looped Systems
Is this an open or closed looped system?