Question detail

A transformer is used in a alternator output trace coil-core 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.

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Induced potential, transformers and the National Grid (physics only) (HT only)

Question

A transformer is used in a alternator output trace coil-core 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: fluxcue554a coilcue554b fieldcue554c polecue554d gridcue554e motorcue554f generatorcue554g transformercue554h compasscue554i currentcue554j voltagecue554k forcecue554l.

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 fluxcue554a coilcue554b fieldcue554c polecue554d gridcue554e motorcue554f generatorcue554g transformercue554h compasscue554i currentcue554j voltagecue554k forcecue554l: 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 induced and supplied...

Treating induced and supplied current as interchangeable when answering about National Grid transformer reasoning.

Instead, identify the exact Unit 4.7 idea in Induced potential (HT only), then explain how it links to an alternator producing an AC output trace and the objective to state that an induced current generates a magnetic field that opposes the original change.

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