Exam-style question
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In the gravitational-potential graph scenario, a graph of gravitational potential against distance is interpreted for two radii. Which option best applies the AQA A-Level Physics objective to calculate power in AC circuits using rms values where appropriate. while avoiding describing potential as a force rather than energy per unit mass?.
- A.field-case-05: Apply Calculate power in AC circuits using rms values where appropriate. within Alternating currents.
- B.field-case-05: Treat Alternating currents as separate from Magnetic fields, so the measured field idea is not used.
- C.field-case-05: Choose a memorised equation without checking direction, sign, field geometry or units.
- D.field-case-05: Replace the A-Level fields reasoning with a broad GCSE label only.
Model answer
What a good answer should say
- The correct option is field-case-05: Apply Calculate power in AC circuits using rms values where appropriate.
- within Alternating currents.
Explanation
Why this works
It is correct because it keeps the reasoning inside Alternating currents and answers the approved learning objective: Calculate power in AC circuits using rms values where appropriate. The other options are weaker because they switch to the wrong fields concept, ignore the measured quantity, lose direction or sign information, or use a generic statement instead of A-Level Physics reasoning.
Common mistake
No common mistake is linked to this question yet.