Physics A-Level
Feedback control systems
What Feedback control systems means in Physics A-Level, as defined for AQA.
Definition of Feedback control systems
Check what you remember
Read the wording for your board, then hide it and explain Feedback control systems in your own words. Rough notes are fine. This is a self-check, with no mark or grade.
Reference: AQA
A feedback system adjusts the tip height to keep the tunnelling current constant as the tip is scanned across the surface.
Topics that use Feedback control systems
- Electron microscopes (A-level only) (AQA A-Level)
Related terms
- de Broglie wavelength of electrons
- Energy conservation in electron acceleration
- Order-of-magnitude estimation in physics
- Quantum tunnelling
- Resolution limits of electron microscopes
- Resolution limits of microscopes
- Specimen preparation and vacuum requirements
- Wave-particle duality and the de Broglie wavelength
Using Feedback control systems in the exam
Check the command word and mark scheme for your exact question. After comparing your explanation with the reference, use the term in an answer on the linked topic. This practice does not predict an exam mark.
Practise Physics questions
Create a free account to answer exam-style questions on this topic and get feedback on your answers.
Start free
All Physics A-Level termsA week of Premium from your first lesson · Then the free plan continues · No card, no charge