Question detail

A transformer is used in a loudspeaker cone test AC-output 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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The motor effect

Question

A transformer is used in a loudspeaker cone test AC-output 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: fluxcue519a coilcue519b fieldcue519c polecue519d gridcue519e motorcue519f generatorcue519g transformercue519h compasscue519i currentcue519j voltagecue519k forcecue519l.

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 fluxcue519a coilcue519b fieldcue519c polecue519d gridcue519e motorcue519f generatorcue519g transformercue519h compasscue519i currentcue519j voltagecue519k forcecue519l: 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 Loudspeakers (physics only) (HT only), then explain how it links to a steel core electromagnet demonstration and the objective to link the motion of the coil or cone to pressure variations in the surrounding air.

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