Voltages and Turns in a Transformer

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Homework Help Overview

The discussion revolves around the principles of transformers, specifically focusing on the relationship between voltage ratios and the number of turns in step-up and step-down transformers. Participants are exploring the application of Faraday's law in this context.

Discussion Character

  • Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • Participants are questioning whether the voltage ratios in transformers correspond to the turns ratios, and how Faraday's law applies to both the primary and secondary sides of transformers. There is an exploration of the reasoning behind these relationships.

Discussion Status

Some participants have provided insights into the application of Faraday's law and its implications for the voltage and turns ratios in transformers. There appears to be a productive exchange of ideas, with various interpretations being explored, though no explicit consensus has been reached.

Contextual Notes

Participants are considering the ideal conditions of transformers and the assumptions that may affect the application of the discussed principles.

fromthepast
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In a step-up transformer, should the ratio of the voltages be approximately equal to the ratio of the number of turns? Why?

Same for a step-down transformer: should the ratio of the voltages be approximately equal to the ratio of the number of turns? Why?

Thanks
 
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For starters how does Faraday's law apply to the transformer in either the primary or secondary side?
 
Faraday's law includes the rate of change in magnetic flux through the coil and the number of turns in the coil. I think that the ratio of the secondary emf over the primary emf should equal the ratio of the secondary turns divided by the primary turns; so they should be equal for step-up and step-down. Is my thinking right?
 
fromthepast said:
Faraday's law includes the rate of change in magnetic flux through the coil and the number of turns in the coil. I think that the ratio of the secondary emf over the primary emf should equal the ratio of the secondary turns divided by the primary turns; so they should be equal for step-up and step-down. Is my thinking right?

Yes they will be the same for any transformer (ideal).

For a step up transformer, the number of turns in the secondary > number of turns in primary so the voltages will change accordingly but the ratios of Ns/Np will remain the same.
 

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