Transformer questions - primary, secondary, gaaaah

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SUMMARY

The discussion centers on calculating the secondary voltage of a step-up transformer with 100 turns in the primary and 200 turns in the secondary, given a primary voltage of 100 V ± 2%. The correct secondary voltage is determined to be 200 V ± 4 V, as the uncertainty in the secondary voltage is derived from the primary voltage's uncertainty. The participant incorrectly selected an answer that included an additional percentage uncertainty, which was not applicable in this case.

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Transformer questions - primary, secondary, gaaaah!

Hello, I really need help with this. Much appreciated! Thank you so much in advance for any help!

Homework Statement



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

Homework Equations



Vs/Vp=Ns/Np

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.
 
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Thank you!
 


There is no more uncertainty introduced in the secondary voltage, so it is still +/- 2%. To trick you, they omitted this selection and instead put the real value of 2% which is just 2% of 200 (4 volts)
 

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