Transformer Ratio (1 Viewer)

[Kukudas]

You guys know the ratio formula for transformer right?
Vp/Vs = np/ns yeah???

For current , is it
Ip/Is = np/ns
OR
Is/Ip = np/ns

people tells me different answer -_-

can u guys tell me which one is right and why???

THANK YOU!!!

GO HSC 2007 WOOT!!!

 

[Bank$]

its

Is/Ip = np/ns

 

[idling fire]

For the idealistic transformer we use in HSC physics, the energy transformation has no loss, therefore
Ep = Es
Pp = Ps

and since P=VI
then Vp*Ip = Vs*Is ... (1)

The more coils, the more EMF (ie voltage). So we can see that you are correct:
np/ns = Vp/Vs

Then, the power must remain constant, so an increase in voltage means a decrease in current (or dec. V meanse inc. I) From (1) just rearrange the equation.
ie. Vp/Vs = Is/Ip
So that means, np/ns = Is/Ip

 

[Kukudas]

thank you i see

do u have know how did u get the formula Is/Ip
from Vp/Vs in detail?
or just know the formula??

 

[idling fire]

thank you i see

do u have know how did u get the formula Is/Ip
from Vp/Vs in detail?
or just know the formula??

I think we just have to know the formula, and that it is because of conservation of energy. But knowing the rest won't hurt

 

[thehootman]

Lol its on the data sheet.