Question detail
Which explanation best links the observation to the physics? Context: step-down charger transformer 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: fluxcue714a coilcue714b fieldcue714c polecue714d gridcue714e motorcue714f generatorcue714g transformercue714h compasscue714i currentcue714j voltagecue714k forcecue714l.
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-down charger transformer 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 reverses the role of primary and secondary coils. (turns-ratio error).
- C. It assumes transformers work on direct current without changing flux. (AC-output error).
- D. It states the turns ratio changes resistance rather than voltage. (coil-core error).
Answer
Transformers (HT only): step-down charger transformer 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-down charger transformer 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-down charger transformer cause detail makes the option distinct from nearby objectives while still testing the same AQA GCSE Physics learning objective. V10 boundary check fluxcue714a coilcue714b fieldcue714c polecue714d gridcue714e motorcue714f generatorcue714g transformercue714h compasscue714i currentcue714j voltagecue714k forcecue714l: 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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