A transformer operates with which type of current?

Enhance your skills with the Transformers Test 1. Utilize flashcards and multiple choice questions, each accompanied by hints and explanations. Ensure you're fully prepared for your exam!

Multiple Choice

A transformer operates with which type of current?

Explanation:
Transformers rely on alternating current because energy transfer depends on a continuously changing magnetic flux in the core. The voltage on the windings is proportional to how fast the magnetic flux changes (v = N dφ/dt). With AC, the current and thus the flux oscillate, so the secondary voltage follows and power can be transferred reliably. If direct current is applied, the flux quickly reaches a steady level and dφ/dt becomes zero, so no sustained emf is produced in the secondary and no steady energy transfer occurs. Pulsating DC and mixed DC/AC introduce a DC component that tends to saturate the core and disrupt normal operation, causing inefficiency and overheating. In short, only alternating current maintains the continuous, alternating flux a transformer needs to work properly.

Transformers rely on alternating current because energy transfer depends on a continuously changing magnetic flux in the core. The voltage on the windings is proportional to how fast the magnetic flux changes (v = N dφ/dt). With AC, the current and thus the flux oscillate, so the secondary voltage follows and power can be transferred reliably.

If direct current is applied, the flux quickly reaches a steady level and dφ/dt becomes zero, so no sustained emf is produced in the secondary and no steady energy transfer occurs. Pulsating DC and mixed DC/AC introduce a DC component that tends to saturate the core and disrupt normal operation, causing inefficiency and overheating. In short, only alternating current maintains the continuous, alternating flux a transformer needs to work properly.

More Multiple Choice Questions
Subscribe

Get the latest from Passetra

You can unsubscribe at any time. Read our privacy policy