Discussion
A Step-Up Transformer Increases
Answer: D
A step-up transformer increases voltage.
The secondary has more turns than the primary: \[\frac{V_s}{V_p} = \frac{N_s}{N_p}\] Power is conserved apart from losses, so the current falls in the same proportion, and the frequency is unchanged. Stepping voltage up for transmission is what cuts \(I^2R\) losses in the line.
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