Question detail
Select the statement that would earn credit in an AQA GCSE Physics answer. Context: power-station transformer evidence. Learning objective: (Physics only) (HT only) Identify Vp and Vs as potential differences in volts.. Which answer is most accurate for Transformers (HT only)? Distinct revision anchor: fluxcue731a coilcue731b fieldcue731c polecue731d gridcue731e motorcue731f generatorcue731g transformercue731h compasscue731i currentcue731j voltagecue731k forcecue731l.
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): power-station transformer evidence shows (Physics only) (HT only) Identify Vp and Vs as potential differences in volts. because magnetic effects depend on field direction, current or changing magnetic flux.
- B. It swaps motor and generator reasoning. (safety error).
- C. It describes gravitational force instead of magnetic force. (efficiency error).
- D. It claims induced current is supplied by a cell. (energy-transfer error).
Answer
Transformers (HT only): power-station transformer evidence shows (Physics only) (HT only) Identify Vp and Vs as potential differences in volts. because magnetic effects depend on field direction, current or changing magnetic flux.
Explanation
Transformers (HT only): power-station transformer evidence shows (Physics only) (HT only) Identify Vp and Vs as potential differences in volts. 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 power-station transformer evidence detail makes the option distinct from nearby objectives while still testing the same AQA GCSE Physics learning objective. V10 boundary check fluxcue731a coilcue731b fieldcue731c polecue731d gridcue731e motorcue731f generatorcue731g transformercue731h compasscue731i currentcue731j voltagecue731k forcecue731l: 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-down transformer for a low-voltage device and the objective to identify Vp and Vs as potential differences in volts.
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