Question detail
Which response uses the correct technical wording for this situation? Context: alternator output trace evidence. Learning objective: (Physics only) (HT only) Describe a step-up transformer as having secondary potential difference greater than primary potential difference.. Which answer is most accurate for Transformers (HT only)? Distinct revision anchor: fluxcue746a coilcue746b fieldcue746c polecue746d gridcue746e motorcue746f generatorcue746g transformercue746h compasscue746i currentcue746j voltagecue746k forcecue746l.
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): alternator output trace evidence shows (Physics only) (HT only) Describe a step-up transformer as having secondary potential difference greater than primary potential difference. because magnetic effects depend on field direction, current or changing magnetic flux.
- B. It reverses the role of primary and secondary coils. (direction error).
- C. It assumes transformers work on direct current without changing flux. (cause error).
- D. It states the turns ratio changes resistance rather than voltage. (evidence error).
Answer
Transformers (HT only): alternator output trace evidence shows (Physics only) (HT only) Describe a step-up transformer as having secondary potential difference greater than primary potential difference. because magnetic effects depend on field direction, current or changing magnetic flux.
Explanation
Transformers (HT only): alternator output trace evidence shows (Physics only) (HT only) Describe a step-up transformer as having secondary potential difference greater 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 alternator output trace evidence detail makes the option distinct from nearby objectives while still testing the same AQA GCSE Physics learning objective. V10 boundary check fluxcue746a coilcue746b fieldcue746c polecue746d gridcue746e motorcue746f generatorcue746g transformercue746h compasscue746i currentcue746j voltagecue746k forcecue746l: 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 calculation using primary and secondary coils and the objective to describe a step-up transformer as having secondary potential difference greater than primary potential difference.
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