everyday science MCQ #50174

A transformer needs a changing magnetic flux in its core. Why is AC suited for stepping voltage up or down?

everyday science MCQ #50174

  1. Question 1

    Q1. A transformer needs a changing magnetic flux in its core. Why is AC suited for stepping voltage up or down?

    • A) Because AC voltage changes with time producing changing flux
    • B) Because AC has constant DC offset always
    • C) Because AC cannot create magnetic fields
    • D) Because AC means zero current always

    Answer: Because AC voltage changes with time producing changing flux

    Explanation: A transformer operates on the principle of electromagnetic induction, which requires a changing magnetic flux through the core to induce a voltage in the secondary coil. Alternating current continuously reverses direction, creating the continuously changing flux needed, whereas direct current produces a static field that cannot induce a sustained secondary voltage.