Question detail

A transformer is used in a moving-wire motor effect evidence 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 moving-wire motor effect evidence 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: fluxcue169a coilcue169b fieldcue169c polecue169d gridcue169e motorcue169f generatorcue169g transformercue169h compasscue169i currentcue169j voltagecue169k forcecue169l.

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 fluxcue169a coilcue169b fieldcue169c polecue169d gridcue169e motorcue169f generatorcue169g transformercue169h compasscue169i currentcue169j voltagecue169k forcecue169l: 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 Poles of a magnet, then explain how it links to a student comparing motor and generator effects and the objective to describe the attraction and repulsion between unlike and like poles for permanent magnets.

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