Question detail
A transformer is used in a step-down charger transformer 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.
At a glance
Question
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Topic
Permanent and induced magnetism, magnetic forces and fields
Question
A transformer is used in a step-down charger transformer 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: fluxcue162a coilcue162b fieldcue162c polecue162d gridcue162e motorcue162f generatorcue162g transformercue162h compasscue162i currentcue162j voltagecue162k forcecue162l.
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 fluxcue162a coilcue162b fieldcue162c polecue162d gridcue162e motorcue162f generatorcue162g transformercue162h compasscue162i currentcue162j voltagecue162k forcecue162l: 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 step-down transformer for a low-voltage device and the objective to state that an induced magnet loses most or all of its magnetism quickly when removed from the magnetic field.
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