Question detail
Select the statement that would earn credit in an AQA GCSE Physics answer. Context: power-station transformer boundary. Learning objective: (Physics only) (HT only) Describe a step-down transformer as having secondary potential difference less than primary potential difference.. Which answer is most accurate for Transformers (HT only)? Distinct revision anchor: fluxcue755a coilcue755b fieldcue755c polecue755d gridcue755e motorcue755f generatorcue755g transformercue755h compasscue755i currentcue755j voltagecue755k forcecue755l.
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): power-station transformer boundary shows (Physics only) (HT only) Describe a step-down transformer as having secondary potential difference less than primary potential difference. because magnetic effects depend on field direction, current or changing magnetic flux.
- B. It swaps motor and generator reasoning. (safety error).
- C. It describes gravitational force instead of magnetic force. (efficiency error).
- D. It claims induced current is supplied by a cell. (energy-transfer error).
Answer
Transformers (HT only): power-station transformer boundary shows (Physics only) (HT only) Describe a step-down transformer as having secondary potential difference less than primary potential difference. because magnetic effects depend on field direction, current or changing magnetic flux.
Explanation
Transformers (HT only): power-station transformer boundary shows (Physics only) (HT only) Describe a step-down transformer as having secondary potential difference less than primary potential difference. 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 power-station transformer boundary detail makes the option distinct from nearby objectives while still testing the same AQA GCSE Physics learning objective. V10 boundary check fluxcue755a coilcue755b fieldcue755c polecue755d gridcue755e motorcue755f generatorcue755g transformercue755h compasscue755i currentcue755j voltagecue755k forcecue755l: 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 primary and secondary...
Treating primary and secondary coils 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 bar magnet and plotting compass practical and the objective to describe a step-down transformer as having secondary potential difference less than primary potential difference.
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