Question detail
Select the statement that would earn credit in an AQA GCSE Physics answer. Context: step-up transformer demonstration cause. Learning objective: (Physics only) (HT only) Explain how the effect of an alternating current in one coil inducing a current in another is used in transformers.. Which answer is most accurate for Transformers (HT only)? Distinct revision anchor: fluxcue713a coilcue713b fieldcue713c polecue713d gridcue713e motorcue713f generatorcue713g transformercue713h compasscue713i currentcue713j voltagecue713k forcecue713l.
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-up transformer demonstration cause shows (Physics only) (HT only) Explain how the effect of an alternating current in one coil inducing a current in another is used in transformers. 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
Transformers (HT only): step-up transformer demonstration cause shows (Physics only) (HT only) Explain how the effect of an alternating current in one coil inducing a current in another is used in transformers. because magnetic effects depend on field direction, current or changing magnetic flux.
Explanation
Transformers (HT only): step-up transformer demonstration cause shows (Physics only) (HT only) Explain how the effect of an alternating current in one coil inducing a current in another is used in transformers. 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-up transformer demonstration cause detail makes the option distinct from nearby objectives while still testing the same AQA GCSE Physics learning objective. V10 boundary check fluxcue713a coilcue713b fieldcue713c polecue713d gridcue713e motorcue713f generatorcue713g transformercue713h compasscue713i currentcue713j voltagecue713k forcecue713l: 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 magnetic field...
Treating magnetic field direction and force direction 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 dynamo producing a DC output trace and the objective to explain how the effect of an alternating current in one coil inducing a current in another is used in transformers.
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