Question detail
A transformer is used in a primary-secondary coil comparison application 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.
At a glance
Question
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Topic
Permanent and induced magnetism, magnetic forces and fields
Question
A transformer is used in a primary-secondary coil comparison application 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: fluxcue219a coilcue219b fieldcue219c polecue219d gridcue219e motorcue219f generatorcue219g transformercue219h compasscue219i currentcue219j voltagecue219k forcecue219l.
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 fluxcue219a coilcue219b fieldcue219c polecue219d gridcue219e motorcue219f generatorcue219g transformercue219h compasscue219i currentcue219j voltagecue219k forcecue219l: 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 dynamo producing a DC output trace and the objective to describe the direction of a magnetic field as the direction of the force on a north pole placed at that point.
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