How Do You Prove Vpri in This Transformer Circuit Problem?

[sero2000]

Homework Statement

http://img169.imageshack.us/img169/8502/73860646mw1.jpg

Given
R3= 10.0Ω
IR1= 2.0A

Prove that Vpri =30( 10R1+R1R2+10R2)/R2

Homework Equations

The Attempt at a Solution

Current across R2= 2xR1/R2
Current across R3= 2R1/R2 +2A
Total Voltage in sec coil= [2R1/R2 +2] x10 + 2R1
= 20R1+20+2R1R2/R2

Im stuck here currently=( any help?

 

[Ouabache]

Homework Statement

Given
R3= 10.0Ω
IR1= 2.0A

Prove that Vpri =30( 10R1+R1R2+10R2)/R2

Is this the only information given? Are you sure the 2A current is through R1?

Current across R2= 2xR1/R2
Current across R3= 2R1/R2 +2A

We describe current as going through an element (such as a resistor), rather than across it. Voltage, on the other hand, is measured across an element.

 

[sero2000]

Is this the only information given? Are you sure the 2A current is through R1?



We describe current as going through an element (such as a resistor), rather than across it. Voltage, on the other hand, is measured across an element.

Yea the current through R1 is 2.0A. I already gt the answer=) apprently the teacher forgot to give the turns ratio for the qn. Thanks anyways=)

 

[Ouabache]

I thought so, I was just about to add, unless this were an isolation transformer, I would expect a ratio of turns (N1:N2), voltage (Vp:Vs), or current (Ip:Is) to be given.

What was the turns ratio? (I'd like to solve this one too).

 

[sero2000]

I thought so, I was just about to add, unless this were an isolation transformer, I would expect a ratio of turns (N1:N2), voltage (Vp:Vs), or current (Ip:Is) to be given.

What was the turns ratio? (I'd like to solve this one too).

Oh the turns ratio was 15:1