is turns ratio of transformer same as ratio of voltages across transformer? why or why not?

Answer 1

yes, in a balanced(read equi distant coils) transformer, the voltages ratio will be proportional to the turns ratio.
This is because the voltage is produced by the flux lines cutting thru the coil. When more flux lines are cut, (by a tightly wound coil), the voltage is higher.


So now in the transformer context. ... Take a tight coil on one side and a loose one on the other side. The voltage is fed to the tight coil. So now there is voltage passing thru the tight coil and causing flux lines. These lines would be cut by the secondary coil (loose coil) and voltage would be induced in this coil. Since the coil has less turns, there will be a proportionately less voltage induced in the secondary coil. This is the transformer concept..

Remember transformer is only for A.C. and the ratio varies if you put an iron block between (non center) the coils to change the flux pattern.

Answer 2

Basically, you are right. But it needs to be stated in the following way.

The ratio of a transformer's output voltage (secondary voltage) to its input voltage(primary voltage) is equal to the ratio of the transformer's output (secondary) turns to its input (primary) turns.

So, if voltage Vp is applied across a transformer's primary input terminals which has Np turns in its windings and the measured output is Vs across the secondary terminals which has Ns turns in its windings then,

Vs / Vp = Ns / Np

The reason for why this happens has to do with the fact that the amount of magnetic flux linkage between the primary and secondary windings and the Faraday's laws which states that the induced voltage is given as

v = N (d@ / dt)

where d@ / dt = rate of change of the magnetic flux with respect to time. If you have had any calculus, then I am sure you know this mathematics.

I don't know how much details you are looking for, but you can read more in any electrical engineering AC circuit analysis textbooks or electric machinery textbooks.

You don't need to know calculus, but if you have a background in calculus, you will have no trouble picking up the theory behind transformers and the induced voltages from Faraday's law.

Hope this helps.

Answer 3

Turns Ratio

Answer 4

yeah

thats waht a transformer is

a thing with wire wound around steel plates

yeah , if it has 10x as many windings on one side, then 10X the voltage, the Amps (current) might decrease

Answer 5

Hi. I believe it is amperes, not voltage. http://www.tpub.com/neets/book2/5g.htm

Answer 6

im not so sure