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**1. Homework Statement**

A step down transformer produces a voltage of 6.0 V across the secondary coil when the voltage across the primary coil is 120 V. What voltage appears across the primary coil of this transormer if 120 V is applied to the secondary coil?

**2. Homework Equations**

Vp/Vs=Np/Ns=Is/Ip ................. ???? (not sure if that is relevant really)

**3. The Attempt at a Solution**

i know Vs/Vp = 120/6

i think i dont really know what to do with the 120 v applied to the secondary coil

i added 120 to the 6 = 126 that means 6 was multiplied by a factor of 21

so i multiplied the top value of the ratio (120) by 21 and got 2520 v

but im really not sure if thats right at all? what does "120 V is applied" in mathematical terms?