Question detail
A transformer is used in a solenoid strength investigation current-change 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
The motor effect
Question
A transformer is used in a solenoid strength investigation current-change 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: fluxcue429a coilcue429b fieldcue429c polecue429d gridcue429e motorcue429f generatorcue429g transformercue429h compasscue429i currentcue429j voltagecue429k forcecue429l.
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 fluxcue429a coilcue429b fieldcue429c polecue429d gridcue429e motorcue429f generatorcue429g transformercue429h compasscue429i currentcue429j voltagecue429k forcecue429l: 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
motor-effect force direction: avoid motors and generators
Treating motors and generators as interchangeable when answering about motor-effect force direction.
Instead, identify the exact Unit 4.7 idea in Fleming's left-hand rule (HT only), then explain how it links to a calculation using primary and secondary coils and the objective to identify force F in newtons, magnetic flux density B in tesla, current I in amperes and length l in metres.
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