Input and output voltages of a transformer?

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Homework Help Overview

The discussion revolves around the concept of transformers, specifically focusing on the relationship between input and output voltages and the number of turns in the coils. The original poster presents a problem involving a generator producing AC voltage and a transformer stepping it up for transmission.

Discussion Character

  • Exploratory, Conceptual clarification, Problem interpretation

Approaches and Questions Raised

  • Participants discuss the fundamental principles of transformers, including the relationship between voltage and turns of wire. The original poster attempts to apply the transformer equations to solve a specific problem involving given voltages and turns.

Discussion Status

Some participants provide insights into the basic operation of transformers and suggest using the voltage-turns relationship to find the number of turns in the output coil. There is an acknowledgment of differing opinions from external tutors, indicating a potential for further exploration of the topic.

Contextual Notes

There is mention of conflicting information from tutors, which may affect the understanding of the original poster. The problem is framed within the context of homework help, suggesting constraints on the level of assistance that can be provided.

derfrok
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okay, I Don't quite grasp this concept but!. Vo/Vi = No/Ni.

And I have this problem. A Generator at a power plant produces AC at 24,000 V.A transformer steps this up to 345,000 V for transmission over power lines. IF there are 2000 turns of wire in the input coil of the transformer, how many turns must there be in the output coil? :biggrin:
 
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Heres how u do the problem...

First let me tell u the basics of a transformer. A transformer is a mutual inductance based device that transfers power from one part to the other. It does so by virtue of stepping up the voltage or the current.
i.e VI = constant. So if the input voltage, current and the number of turns are V1, I1 and N1 and those on the o/p are V2, I2 and N2, then,


N1*V1*I1 = N2*V2*I2 .

So, the voltage or current level can be stepped up or stepped down accordingly. Do u understand the concept now?

And about the solution to ur problem, I think u have answered ur qn. The answer is: Vin/Vout = Nin/Nout.


Sridhar
 
Yes, "Vo/Vi = No/Ni" . Also you are told that Vi= 24000, Vo= 345000 and Ni= 2000. Put those into the equation and you have:

345000/24000= No/2000. Can you solve for No?
 
ah! thanks guys.. see i thought i had the answer down! But, the tutors at my school we're telling me something else! Thanks for ellaborating! :biggrin:
 

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