Question detail
A transformer is used in a step-down charger transformer prediction 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
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Topic
The motor effect
Question
A transformer is used in a step-down charger transformer prediction 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: fluxcue282a coilcue282b fieldcue282c polecue282d gridcue282e motorcue282f generatorcue282g transformercue282h compasscue282i currentcue282j voltagecue282k forcecue282l.
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 fluxcue282a coilcue282b fieldcue282c polecue282d gridcue282e motorcue282f generatorcue282g transformercue282h compasscue282i currentcue282j voltagecue282k forcecue282l: 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 Electromagnetism, then explain how it links to a bar magnet and plotting compass practical and the objective to state that when a current flows through a conducting wire a magnetic field is produced around the wire.
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