Question detail

A transformer is used in a solenoid strength investigation boundary 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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Topic

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

Question

A transformer is used in a solenoid strength investigation boundary 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: fluxcue765a coilcue765b fieldcue765c polecue765d gridcue765e motorcue765f generatorcue765g transformercue765h compasscue765i currentcue765j voltagecue765k forcecue765l.

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 fluxcue765a coilcue765b fieldcue765c polecue765d gridcue765e motorcue765f generatorcue765g transformercue765h compasscue765i currentcue765j voltagecue765k forcecue765l: 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 AC and DC

Treating AC and DC as interchangeable when answering about National Grid transformer reasoning.

Instead, identify the exact Unit 4.7 idea in Transformers (HT only), then explain how it links to a steel core electromagnet demonstration and the objective to explain how the ratio of potential differences across the two coils depends on the ratio of turns on each coil.

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AQA GCSE Physics Induced potential, transformers question detail | ExamCompanion