Question detail

A transformer is used in a wind-turbine generator measurement 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.

Try the question, check the answer, then read the explanation to understand the curriculum point.

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Topic

Permanent and induced magnetism, magnetic forces and fields

Question

A transformer is used in a wind-turbine generator measurement 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.

Answer

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: fluxcue232a coilcue232b fieldcue232c polecue232d gridcue232e motorcue232f generatorcue232g transformercue232h compasscue232i currentcue232j voltagecue232k forcecue232l.

Explanation

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 fluxcue232a coilcue232b fieldcue232c polecue232d gridcue232e motorcue232f generatorcue232g transformercue232h compasscue232i currentcue232j voltagecue232k forcecue232l: 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

generator-effect induction: avoid permanent and induced magnets

Treating permanent and induced magnets as interchangeable when answering about generator-effect induction.

Instead, identify the exact Unit 4.7 idea in Magnetic fields, then explain how it links to a step-up transformer on the National Grid and the objective to describe a magnetic compass as containing a small bar magnet.

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