Question detail
Select the statement that would earn credit in an AQA GCSE Physics answer. Context: overhead cable transmission boundary. Learning objective: (Physics only) (HT only) Calculate primary potential difference, secondary potential difference, primary turns or secondary turns using transformer ratios.. Which answer is most accurate for Transformers (HT only)? Distinct revision anchor: fluxcue767a coilcue767b fieldcue767c polecue767d gridcue767e motorcue767f generatorcue767g transformercue767h compasscue767i currentcue767j voltagecue767k forcecue767l.
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): overhead cable transmission boundary shows (Physics only) (HT only) Calculate primary potential difference, secondary potential difference, primary turns or secondary turns using transformer ratios. because magnetic effects depend on field direction, current or changing magnetic flux.
- B. It swaps motor and generator reasoning. (load-effect error).
- C. It describes gravitational force instead of magnetic force. (power-link error).
- D. It claims induced current is supplied by a cell. (exam-command error).
Answer
Transformers (HT only): overhead cable transmission boundary shows (Physics only) (HT only) Calculate primary potential difference, secondary potential difference, primary turns or secondary turns using transformer ratios. because magnetic effects depend on field direction, current or changing magnetic flux.
Explanation
Transformers (HT only): overhead cable transmission boundary shows (Physics only) (HT only) Calculate primary potential difference, secondary potential difference, primary turns or secondary turns using transformer ratios. 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 overhead cable transmission boundary detail makes the option distinct from nearby objectives while still testing the same AQA GCSE Physics learning objective. V10 boundary check fluxcue767a coilcue767b fieldcue767c polecue767d gridcue767e motorcue767f generatorcue767g transformercue767h compasscue767i currentcue767j voltagecue767k forcecue767l: 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 current-carrying wire between magnetic poles and the objective to calculate primary potential difference, secondary potential difference, primary turns or secondary turns using transformer ratios.
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