# tranformer formulas not matching actual measurements

#### collegemark01

Joined Jun 27, 2016
1
hi
I have been given a problem to solve on transformers.
using
Code:
Vp = Np = Is
---  ---  ---
Vs   Ns   Ip

Vp 242v
Ip 0.43a

AND ASKED TO FIND Vs AND Is
using formula not even getting close to measured result of
Vs 12.9v
Is 5.37a

Can anyone help?

email: <SNIP>

Moderators note : removed email to prevent spammers, used code tags to preserve spaces

Last edited by a moderator:

#### Papabravo

Joined Feb 24, 2006
17,228
You're right, the given values and the measurements are at odds. What is you want from us? My best theory is that you don't know what you are doing, and are comparing an AC input (mains) to a DC output, since you did not specify that your measured voltage was VAC(rms). You have the same ambiguity in your current measurements as well.

One should learn to crawl and walk before trying to run a marathon.

Last edited:

#### Alec_t

Joined Sep 17, 2013
12,309
What load did you have connected to the secondary?

#### Papabravo

Joined Feb 24, 2006
17,228
What load did you have connected to the secondary?
At least the power out is less than the power in. Had it been the other way, it would have been the first known overunity transformer.