Physics · Alternating Current and Transformers
What is the primary technical reason that a standard power transformer cannot operate on a steady DC supply?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1DC current fails to create any magnetic field within the transformer core.
- 2The constant current prevents the creation of a varying magnetic flux, which is necessary to induce a counter-emf, resulting in potentially destructive primary current levels.✓
- 3The DC resistance of the primary winding is inherently infinite, preventing current flow.
- 4Transformers are designed specifically to utilize the skin effect, which only exists in DC conductors.
Correct answer
The constant current prevents the creation of a varying magnetic flux, which is necessary to induce a counter-emf, resulting in potentially destructive primary current levels.
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