# Effective resistance of secondary circuit in transformers

1. Aug 4, 2010

### sarah68

1. The problem statement, all variables and given/known data
You need a transformer to reduce a voltage of 150 V in the primary circuit to 25 V in the secondary circuit. The primary circuit has 130 windings and the secondary circuit is completed through a 55 ? resistor. (a) How many windings should the secondary circuit contain? (b) What is the effective resistance of the secondary circuit?

2. Relevant equations

V2/V1=N2/N1

Reff= R(N1/N2)^2

3. The attempt at a solution

I solved part A. N2 is 22 windings. However, part B is 1500 but I can't seem to get that answer! I used the above equation but it doesn't give me that answer. Is the Reff equation that I'm using wrong? Please help me!

2. Aug 4, 2010

### praveenpp

i think you got the secondary circuit voltage and windings also. ya its correct secondary circuit resistance is depend on load only.

3. Aug 4, 2010

### sarah68

Yes, but if I plug in the values with that equation I don't get 1500 for part B. I don't know what I'm doing wrong.

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