A transformer cannot raise or lower the voltage of a D.C. supply because_______________?
Correct answer: C. Faraday's laws of electromagnetic induction are not valid since the rate of change of flux is zero
- A. there is no need to change the D.C. voltage
- B. a D.C. circuit has more losses
- C. Faraday's laws of electromagnetic induction are not valid since the rate of change of flux is zero
- D. none of the above
Explanation
A transformer requires changing magnetic flux to induce an emf, but steady DC produces essentially constant flux after switching. Thus, dΦ/dt becomes zero and the transformer cannot continuously transfer or change DC voltage.
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