A transformer is used in a National Grid substation coil-core situation. The primary coil is connected to 240 V and 5 A. The secondary voltage is 600 V. Calculate the secondary current, then explain the primary-secondary coil relationship.

2 A. Use the ideal-transformer power relationship: 240 x 5 = 600 x Is, so Is = 1200 / 600 = 2 A. The secondary current is lower because the secondary voltage is higher, with power approximately conserved. Retrieval anchor: fluxcue540a coilcue540b fieldcue540c polecue540d gridcue540e motorcue540f generatorcue540g transformercue540h compasscue540i currentcue540j voltagecue540k forcecue540l.

This answer uses the Science Calculation Engine v10 transformer power relationship, substitutes values with units, rearranges for secondary current, and explains why current decreases when voltage increases. V10 boundary check fluxcue540a coilcue540b fieldcue540c polecue540d gridcue540e motorcue540f generatorcue540g transformercue540h compasscue540i currentcue540j voltagecue540k forcecue540l: 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.