Exam-style question
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In the transformer-core diagnosis scenario, a transformer core is checked after a step-up coil reading changes. Which option best applies the AQA A-Level Physics objective to use transformer turns ratio equations. while avoiding confusing flux linkage with current direction?.
- A.field-case-03: Apply Use transformer turns ratio equations. within The operation of a transformer.
- B.field-case-03: Treat The operation of a transformer as separate from Magnetic fields, so the measured field idea is not used.
- C.field-case-03: Choose a memorised equation without checking direction, sign, field geometry or units.
- D.field-case-03: 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-03: Apply Use transformer turns ratio equations.
- within The operation of a transformer.
Explanation
Why this works
It is correct because it keeps the reasoning inside The operation of a transformer and answers the approved learning objective: Use transformer turns ratio equations. 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
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