Physics A-Level
SI units
What SI units means in Physics A-Level, as defined for AQA.
Definition of SI units
Check what you remember
Read the wording for your board, then hide it and explain SI units in your own words. Rough notes are fine. This is a self-check, with no mark or grade.
Reference: AQA
Resistance in ohms and capacitance in farads are used so that τ is in seconds.
Topics that use SI units
- Capacitor charge and discharge (A-level only) (AQA A-Level)
Related terms
- Area under a graph
- Capacitor charging and discharging
- Determining the time constant from a graph
- Effect of larger R or C
- Exponential decay
- Exponential fall during discharge
- Gradient
- Graphical analysis of electrical circuits
Using SI units 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.
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