# Homework Help: Transformer Impedance/Ratio

1. Jun 24, 2009

### photonxyz

1. The problem statement, all variables and given/known data

See attached for a view of the problem

Variables a=transformation ratio= 1/5
Ip=2Amps
ZL=2 ohm resistor

2. Relevant equations
Q1 : Find the current magnitude of the current IL and the Voltage VL
Q2 : Find the input impedence.

3. The attempt at a solution

OK, my question is variable a, which is the transformation ratio is 1/5. From my reading the transformation ratio is equal to the number of turns of the primary divided by the number turns of the secondary...

How

so a= NP/NS = 1/5

NP =1 turn Per NS =5

Then, the input impedence should be Rin = A^2ZL

Rin = (1/5)^2(2 ohms)

Rin = .08 ohms

Does that look correct for the impedance?

Then for the current for IL, a = Is/Ip or Is = (a)(Ip) or Is = .4 amps

does it look correct?

Thanks for any response :)

2. Jun 24, 2009

### negitron

Yes, these figures look correct. You should be able to readily calculate VL now.

3. Jun 24, 2009

### photonxyz

Awesome :) thanks for your response :)