Exam-style question
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Which answer avoids the common misconception in this topic? Context: bicycle dynamo AC-output. Learning objective: (Physics only) (HT only) Link the motion of the coil or cone to pressure variations in the surrounding air.. Which answer is most accurate for Loudspeakers (physics only) (HT only)? Distinct revision anchor: fluxcue514a coilcue514b fieldcue514c polecue514d gridcue514e motorcue514f generatorcue514g transformercue514h compasscue514i currentcue514j voltagecue514k forcecue514l.
- A.Loudspeakers (physics only) (HT only): bicycle dynamo AC-output shows (Physics only) (HT only) Link the motion of the coil or cone to pressure variations in the surrounding air. because magnetic effects depend on field direction, current or changing magnetic flux.
- B.It reverses the role of primary and secondary coils. (comparison error).
- C.It assumes transformers work on direct current without changing flux. (safety error).
- D.It states the turns ratio changes resistance rather than voltage. (efficiency error).
Answer and explanation
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Common mistake
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