Question detail
Select the statement that would earn credit in an AQA GCSE Physics answer. Context: step-up transformer demonstration pole-test. Learning objective: (Physics only) (HT only) State that the generator effect is used in an alternator to generate alternating current.. Which answer is most accurate for Uses of the generator effect (HT only)? Distinct revision anchor: fluxcue593a coilcue593b fieldcue593c polecue593d gridcue593e motorcue593f generatorcue593g transformercue593h compasscue593i currentcue593j voltagecue593k forcecue593l.
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. Uses of the generator effect (HT only): step-up transformer demonstration pole-test shows (Physics only) (HT only) State that the generator effect is used in an alternator to generate alternating current. because magnetic effects depend on field direction, current or changing magnetic flux.
- B. It treats a permanent magnet as if it only works when current flows. (force-link error).
- C. It confuses the magnetic field with an electric field. (turns-ratio error).
- D. It describes energy transfer but misses the force or field interaction. (AC-output error).
Answer
Uses of the generator effect (HT only): step-up transformer demonstration pole-test shows (Physics only) (HT only) State that the generator effect is used in an alternator to generate alternating current. because magnetic effects depend on field direction, current or changing magnetic flux.
Explanation
Uses of the generator effect (HT only): step-up transformer demonstration pole-test shows (Physics only) (HT only) State that the generator effect is used in an alternator to generate alternating current. because magnetic effects depend on field direction, current or changing magnetic flux. It is correct because it anchors the response to Uses of the generator effect (HT only), uses the relevant magnetic field, coil, current or induction evidence, and avoids mixing motor, generator and transformer ideas. The step-up transformer demonstration pole-test detail makes the option distinct from nearby objectives while still testing the same AQA GCSE Physics learning objective. V10 boundary check fluxcue593a coilcue593b fieldcue593c polecue593d gridcue593e motorcue593f generatorcue593g transformercue593h compasscue593i currentcue593j voltagecue593k forcecue593l: 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 motors and generators
Treating motors and generators as interchangeable when answering about National Grid transformer reasoning.
Instead, identify the exact Unit 4.7 idea in Uses of the generator effect (HT only), then explain how it links to a calculation using primary and secondary coils and the objective to state that the generator effect is used in an alternator to generate alternating current.
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