Physics A-Level
Clock
What Clock means in Physics A-Level, as defined for AQA.
Definition of Clock
Check what you remember
Read the wording for your board, then hide it and explain Clock in your own words. Rough notes are fine. This is a self-check, with no mark or grade.
Reference: AQA
The continuous square-wave signal whose active edge triggers each state change; without it the circuit holds its current state.
Topics that use Clock
- Sequential logic (A-level only) (AQA A-Level)
Related terms
- Asynchronous output changes
- Boolean expression
- Clock-edge triggering
- Johnson counter
- Reset input
- Sequential logic circuits
- Timing diagram
- Truth tables
Using Clock in the exam
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