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dhivakhar
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my friend gave a dc supply to a transformer in my college lab accidentally and the fuse went off can i get an explanation on why this happened?
Why did the fuse blow when a DC supply was connected to a transformer?
- Thread starter dhivakhar
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- Dc Supply Transformer
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Discussion Overview
The discussion revolves around the effects of connecting a DC supply to a transformer, specifically why a fuse blew in such a scenario. Participants explore the operational principles of transformers, particularly in relation to AC and DC voltages, and the implications of using a DC supply.
Discussion Character
- Technical explanation, Conceptual clarification, Debate/contested
Main Points Raised
- Some participants assert that transformers only operate with AC voltage, suggesting that when DC is applied, the transformer behaves like a short circuit due to its low resistance.
- One participant requests clarification on how a transformer exhibits very small resistance to a DC supply.
- Another participant implies that the question may be a disguised homework question, suggesting that the asker should already know the answer.
- It is noted that transformers consist of coils of wire around a core, which inherently have low resistance.
- A later reply discusses the behavior of the current when DC is applied, mentioning that the magnetic field in the iron core takes time to build up and produces a 'back emf' that delays the increase in DC current, potentially leading to the fuse blowing.
Areas of Agreement / Disagreement
Participants generally agree that transformers are designed for AC operation and that applying DC can lead to issues, but there are varying explanations regarding the mechanisms involved and the implications of the current behavior.
Contextual Notes
Some assumptions about the transformer's design and operation under DC conditions are not fully explored, and the discussion includes varying levels of technical detail and understanding among participants.
Who May Find This Useful
This discussion may be useful for students and practitioners interested in electrical engineering, particularly those studying transformer operation and the effects of different types of electrical supply.