Question detail
Select the statement that would earn credit in an AQA GCSE Physics answer. Context: power-station transformer 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: fluxcue803a coilcue803b fieldcue803c polecue803d gridcue803e motorcue803f generatorcue803g transformercue803h compasscue803i currentcue803j voltagecue803k forcecue803l.
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 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.
- 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 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): power-station transformer 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 power-station transformer measurement detail makes the option distinct from nearby objectives while still testing the same AQA GCSE Physics learning objective. V10 boundary check fluxcue803a coilcue803b fieldcue803c polecue803d gridcue803e motorcue803f generatorcue803g transformercue803h compasscue803i currentcue803j voltagecue803k forcecue803l: 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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