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Q: I need answer quick! ( Answered,   0 Comments )
Subject: I need answer quick!
Category: Reference, Education and News > Education
Asked by: wyzgowski7-ga
List Price: $2.00
Posted: 24 May 2005 10:48 PDT
Expires: 23 Jun 2005 10:48 PDT
Question ID: 525070
A trnsformer has a primary voltage of 115 V and a secondary voltage of
24 V. If the number of turns in the primary is 345, how many turns are
in the secondary?
Subject: Re: I need answer quick!
Answered By: welte-ga on 24 May 2005 18:25 PDT
Hi again,

Please see this discussion and sample problem regarding primary and
secondary transformers:

The relationship between coils and voltages is given by

V_p / V_s = n_p / n_s

where V_p = primary voltage
          V_s = secondary voltage
          n_p = primary turns
          n_s = secondary turns

Solving for n_s, we have

n_s = n_p * (V_s / V_p)


n_s = 345 * (24 V / 115 V) = 72

So, the secondary coil has 72 turns.

I hope this was helpful.  Please feel free to request clarification.

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