Transformer questions - primary, secondary, gaaaah!! Hello, I really need help with this. Much appreciated!!! Thank you so much in advance for any help! 1. The problem statement, all variables and given/known data A step-up transformer has exactly 100 turns in the primary and exactly 200 turns in the secondary. If the voltage in the primary is 100 V ± 2 %, what is the voltage in the secondary? a. 200 V ± 4 V b. 200 V ± 4 % c. none of the other answers d. 100 V ± 4 % e. 200 V ± 2 V 2. Relevant equations Vs/Vp=Ns/Np 3. The attempt at a solution OK now here, I know the voltage should be 200V. But the uncertainty .... ? I really don't know where to even begin with that. I chose answer b. 200 V ± 4 %, and it was wrong.