Which explanation best links the observation to the physics? Context: National Grid substation direction. Learning objective: (Physics only) (HT only) Describe a basic transformer as a primary coil and a secondary coil wound on an iron core.. Which answer is most accurate for Transformers (HT only)? Distinct revision anchor: fluxcue684a coilcue684b fieldcue684c polecue684d gridcue684e motorcue684f generatorcue684g transformercue684h compasscue684i currentcue684j voltagecue684k forcecue684l.

Transformers (HT only): National Grid substation direction shows (Physics only) (HT only) Describe a basic transformer as a primary coil and a secondary coil wound on an iron core. because magnetic effects depend on field direction, current or changing magnetic flux.

Transformers (HT only): National Grid substation direction shows (Physics only) (HT only) Describe a basic transformer as a primary coil and a secondary coil wound on an iron core. 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 National Grid substation direction detail makes the option distinct from nearby objectives while still testing the same AQA GCSE Physics learning objective. V10 boundary check fluxcue684a coilcue684b fieldcue684c polecue684d gridcue684e motorcue684f generatorcue684g transformercue684h compasscue684i currentcue684j voltagecue684k forcecue684l: 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.