Question detail
Which conclusion keeps the magnetism concept boundary clear? Context: school bell electromagnet 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: fluxcue775a coilcue775b fieldcue775c polecue775d gridcue775e motorcue775f generatorcue775g transformercue775h compasscue775i currentcue775j voltagecue775k forcecue775l.
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): school bell electromagnet 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 swaps motor and generator reasoning. (measurement error).
- C. It describes gravitational force instead of magnetic force. (diagnosis error).
- D. It claims induced current is supplied by a cell. (prediction error).
Answer
Transformers (HT only): school bell electromagnet 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): school bell electromagnet 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 school bell electromagnet application detail makes the option distinct from nearby objectives while still testing the same AQA GCSE Physics learning objective. V10 boundary check fluxcue775a coilcue775b fieldcue775c polecue775d gridcue775e motorcue775f generatorcue775g transformercue775h compasscue775i currentcue775j voltagecue775k forcecue775l: 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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