Which explanation best links the observation to the physics? Context: National Grid substation boundary. Learning objective: (Physics only) (HT only) Describe a step-down transformer as having secondary potential difference less than primary potential difference.. Which answer is most accurate for Transformers (HT only)? Distinct revision anchor: fluxcue756a coilcue756b fieldcue756c polecue756d gridcue756e motorcue756f generatorcue756g transformercue756h compasscue756i currentcue756j voltagecue756k forcecue756l.

Transformers (HT only): National Grid substation boundary shows (Physics only) (HT only) Describe a step-down transformer as having secondary potential difference less than primary potential difference. because magnetic effects depend on field direction, current or changing magnetic flux.

Transformers (HT only): National Grid substation boundary shows (Physics only) (HT only) Describe a step-down transformer as having secondary potential difference less than primary potential difference. 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 boundary detail makes the option distinct from nearby objectives while still testing the same AQA GCSE Physics learning objective. V10 boundary check fluxcue756a coilcue756b fieldcue756c polecue756d gridcue756e motorcue756f generatorcue756g transformercue756h compasscue756i currentcue756j voltagecue756k forcecue756l: 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.