Homework Help: Transformers voltages homework

1. Nov 12, 2013

vroomba03

1. The problem statement, all variables and given/known data
We have a transformer, the primary coil has 120V and secondary coil has 6V, if you put 8V in secondary coil, what will be the voltage in the primary coil.

2. Relevant equations
v1/v2 = n1/n2 where v is voltage and n is turns

3. The attempt at a solution
So i was thinking that the number of coils is going to be constant because there is no mention of them changing. So in that case the 120v/6v has to equal x/8v, which you would just solve for x, which comes out to 160v. That seemed kind of simple, so I wasnt sure i was doing that right. Any thoughts?
1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution

2. Nov 12, 2013

Staff: Mentor

Yup, it's as simple as that for ideal transformers.

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