Question detail
Which response uses the correct technical wording for this situation? Context: model railway motor application. Learning objective: (Physics only) (HT only) State that if transformers were 100 percent efficient, the electrical power output would equal the electrical power input.. Which answer is most accurate for Transformers (HT only)? Distinct revision anchor: fluxcue776a coilcue776b fieldcue776c polecue776d gridcue776e motorcue776f generatorcue776g transformercue776h compasscue776i currentcue776j voltagecue776k forcecue776l.
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): model railway motor application shows (Physics only) (HT only) State that if transformers were 100 percent efficient, the electrical power output would equal the electrical power input. because magnetic effects depend on field direction, current or changing magnetic flux.
- B. It says field lines travel from south to north outside the magnet. (diagnosis error).
- C. It makes AC and DC equivalent. (prediction error).
- D. It ignores relative motion or changing magnetic flux. (comparison error).
Answer
Transformers (HT only): model railway motor application shows (Physics only) (HT only) State that if transformers were 100 percent efficient, the electrical power output would equal the electrical power input. because magnetic effects depend on field direction, current or changing magnetic flux.
Explanation
Transformers (HT only): model railway motor application shows (Physics only) (HT only) State that if transformers were 100 percent efficient, the electrical power output would equal the electrical power input. 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 model railway motor application detail makes the option distinct from nearby objectives while still testing the same AQA GCSE Physics learning objective. V10 boundary check fluxcue776a coilcue776b fieldcue776c polecue776d gridcue776e motorcue776f generatorcue776g transformercue776h compasscue776i currentcue776j voltagecue776k forcecue776l: 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 loudspeaker coil moving in a magnetic field and the objective to state that if transformers were 100 percent efficient, the electrical power output would equal the electrical power input.
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