In which type of circuit do transformers operate?

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Multiple Choice

In which type of circuit do transformers operate?

Explanation:
Transformers rely on changing magnetic flux to transfer energy. That changing flux is produced when the current in the primary winding alternates, which happens with AC. The alternating flux links with the secondary winding and induces a voltage there, scaled by the turns ratio. If you apply direct current, the current quickly reaches a steady value, so the magnetic flux becomes constant and no new voltage is induced in the secondary. In other words, there’s no continuous energy transfer with DC, aside from a brief transient when the circuit is switched on. That’s why transformers operate in AC circuits.

Transformers rely on changing magnetic flux to transfer energy. That changing flux is produced when the current in the primary winding alternates, which happens with AC. The alternating flux links with the secondary winding and induces a voltage there, scaled by the turns ratio. If you apply direct current, the current quickly reaches a steady value, so the magnetic flux becomes constant and no new voltage is induced in the secondary. In other words, there’s no continuous energy transfer with DC, aside from a brief transient when the circuit is switched on. That’s why transformers operate in AC circuits.

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