What Happens to Primary Voltage if 8V is Applied to Secondary Coil?

[vroomba03]

Homework Statement

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.

Homework Equations

v1/v2 = n1/n2 where v is voltage and n is turns

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?

 

[gneill]

Homework Statement

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.

Homework Equations

v1/v2 = n1/n2 where v is voltage and n is turns

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?

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