Question detail
A transformer is used in a iron-filings field pattern exam-command 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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exam_style
Style
Topic
Induced potential, transformers and the National Grid (physics only) (HT only)
Question
A transformer is used in a iron-filings field pattern exam-command 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: fluxcue667a coilcue667b fieldcue667c polecue667d gridcue667e motorcue667f generatorcue667g transformercue667h compasscue667i currentcue667j voltagecue667k forcecue667l.
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 fluxcue667a coilcue667b fieldcue667c polecue667d gridcue667e motorcue667f generatorcue667g transformercue667h compasscue667i currentcue667j voltagecue667k forcecue667l: 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
National Grid transformer reasoning: avoid motors and generators
Treating motors and generators as interchangeable when answering about National Grid transformer reasoning.
Instead, identify the exact Unit 4.7 idea in Microphones (HT only), then explain how it links to a student comparing motor and generator effects and the objective to explain how a moving-coil microphone works.
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