Transformers Current and Voltage

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Homework Help Overview

The discussion revolves around a transformer problem involving a turns ratio of 5:1, a primary voltage of 230 V, and a secondary current of 2.7 A, with a specified efficiency of 90%. Participants are tasked with determining the secondary voltage and input current.

Discussion Character

  • Mixed

Approaches and Questions Raised

  • Some participants express uncertainty about the applicability of transformer equations due to the assumption of ideal conditions. Others suggest using the efficiency to relate output and input power, while also considering the turns ratio.

Discussion Status

The discussion includes various perspectives on how to approach the problem, with some participants offering guidance on calculating secondary voltage and input current while acknowledging the non-ideal nature of the transformer. There is no explicit consensus on the best method to proceed.

Contextual Notes

Participants note the challenge posed by the assumption of ideal transformers in the context of the problem, as well as the implications of the given efficiency on the calculations.

xvivi
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Homework Statement


A transformer has a turns ratio of 5 : 1. It is connected to a 230 V supply and an output (secondary) current of 2.7 A is measured. If the transformer is 90% efficient, calculate:
  1. Secondary voltage
  2. Input (primary) current
[/B]

Homework Equations


Pout/Pin*100=efficiency[/B]

The Attempt at a Solution


I don't think it can be solved as most of the equations dealing with transformers assume an ideal transformer.[/B]
 
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Hi Xvivi,
The ratio is 5:1, just to remind that even the tronsformer isn't 100% efficient the output is yet the same, the only thing that changes is the ouput current,
You can pull out the ouput voltage, use the fact of thethe 90% efficiency to determine the input current, good luck !
 
xvivi said:
I don't think it can be solved as most of the equations dealing with transformers assume an ideal transformer.
In your analysis here you do include an ideal transformer, then add an external resistance to it to account for its non-ideality.
 
Work out the secondary voltage assuming an ideal transformer.
Work out the output power
Work out the input power allowing for the efficiency being 90%
Work out the input current.
 

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