Question detail
Which explanation best links the observation to the physics? Context: step-down charger transformer boundary. Learning objective: (Physics only) (HT only) Explain how the ratio of potential differences across the two coils depends on the ratio of turns on each coil.. Which answer is most accurate for Transformers (HT only)? Distinct revision anchor: fluxcue762a coilcue762b fieldcue762c polecue762d gridcue762e motorcue762f generatorcue762g transformercue762h compasscue762i currentcue762j voltagecue762k forcecue762l.
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Induced potential, transformers and the National Grid (physics only) (HT only)
Question
- A. Transformers (HT only): step-down charger transformer boundary shows (Physics only) (HT only) Explain how the ratio of potential differences across the two coils depends on the ratio of turns on each coil. because magnetic effects depend on field direction, current or changing magnetic flux.
- B. It reverses the role of primary and secondary coils. (turns-ratio error).
- C. It assumes transformers work on direct current without changing flux. (AC-output error).
- D. It states the turns ratio changes resistance rather than voltage. (coil-core error).
Answer
Transformers (HT only): step-down charger transformer boundary shows (Physics only) (HT only) Explain how the ratio of potential differences across the two coils depends on the ratio of turns on each coil. because magnetic effects depend on field direction, current or changing magnetic flux.
Explanation
Transformers (HT only): step-down charger transformer boundary shows (Physics only) (HT only) Explain how the ratio of potential differences across the two coils depends on the ratio of turns on each coil. because magnetic effects depend on field direction, current or changing magnetic flux. It is correct because it anchors the response to Transformers (HT only), uses the relevant magnetic field, coil, current or induction evidence, and avoids mixing motor, generator and transformer ideas. The step-down charger transformer boundary detail makes the option distinct from nearby objectives while still testing the same AQA GCSE Physics learning objective. V10 boundary check fluxcue762a coilcue762b fieldcue762c polecue762d gridcue762e motorcue762f generatorcue762g transformercue762h compasscue762i currentcue762j voltagecue762k forcecue762l: in the motor effect, the force is perpendicular to the current and magnetic field; in a generator, relative motion or a changing magnetic field induces a potential difference or induced current; outside a magnet, magnetic field lines go from north to south; AC alternating current changes direction, while DC direct current flows in one direction and needs a commutator in a DC generator context.
Common mistake
National Grid transformer reasoning: avoid AC and DC
Treating AC and DC as interchangeable when answering about National Grid transformer reasoning.
Instead, identify the exact Unit 4.7 idea in Transformers (HT only), then explain how it links to a steel core electromagnet demonstration and the objective to explain how the ratio of potential differences across the two coils depends on the ratio of turns on each coil.
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