To satisfy the Common Practical Assessment Criteria (CPAC) for A-level physics, you need to demonstrate competence in the following areas: following written procedures, applying investigative approaches and methods, safely using equipment and materials, making and recording observations, and researching, planning and reporting (including data analysis).
The awarding bodies for A-level physics require or suggest a number of practical activities that will allow you to satisfy the CPACs. Among other requirements, these expect you to be able to make accurate observations relevant to the experiment, to obtain accurate, precise and sufficient data and record these methodically using correct units and conventions, and to use ICT with appropriate sensors to make measurements and software to process data. Measuring the internal resistance of a cell gives an excellent opportunity to practise these skills.
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