Question detail

Which option gives the strongest diagnostic reason? Context: phone speaker coil measurement. Learning objective: (Physics only) (HT only) Calculate the current drawn from the input supply to provide a particular power output.. Which answer is most accurate for Transformers (HT only)? Distinct revision anchor: fluxcue801a coilcue801b fieldcue801c polecue801d gridcue801e motorcue801f generatorcue801g transformercue801h compasscue801i currentcue801j voltagecue801k forcecue801l.

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

  1. A. Transformers (HT only): phone speaker coil measurement shows (Physics only) (HT only) Calculate the current drawn from the input supply to provide a particular power output. because magnetic effects depend on field direction, current or changing magnetic flux.
  2. B. It treats a permanent magnet as if it only works when current flows. (prediction error).
  3. C. It confuses the magnetic field with an electric field. (comparison error).
  4. D. It describes energy transfer but misses the force or field interaction. (safety error).

Answer

Transformers (HT only): phone speaker coil measurement shows (Physics only) (HT only) Calculate the current drawn from the input supply to provide a particular power output. because magnetic effects depend on field direction, current or changing magnetic flux.

Explanation

Transformers (HT only): phone speaker coil measurement shows (Physics only) (HT only) Calculate the current drawn from the input supply to provide a particular power output. 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 phone speaker coil measurement detail makes the option distinct from nearby objectives while still testing the same AQA GCSE Physics learning objective. V10 boundary check fluxcue801a coilcue801b fieldcue801c polecue801d gridcue801e motorcue801f generatorcue801g transformercue801h compasscue801i currentcue801j voltagecue801k forcecue801l: 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 step-up transformer on the National Grid and the objective to calculate the current drawn from the input supply to provide a particular power output.

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