An ideal step-up transformer at a power station links the generators to the high-voltage transmission lines of the national grid. The alternating current in the primary coil is 2.4 kA2.4\text{ kA}2.4 kA and the alternating current in the secondary coil is 80 A.
What are the ratios of the primary-to-secondary voltage, VpVs\displaystyle \frac{V_p}{V_s}VsVp, and the primary-to-secondary turns, NpNs\displaystyle \frac{N_p}{N_s}NsNp, for this transformer?
VpVs=30\frac{V_p}{V_s} = 30VsVp=30 and NpNs=30\frac{N_p}{N_s} = 30NsNp=30
VpVs=130\frac{V_p}{V_s} = \frac{1}{30}VsVp=301 and NpNs=30\frac{N_p}{N_s} = 30NsNp=30
VpVs=130\frac{V_p}{V_s} = \frac{1}{30}VsVp=301 and NpNs=130\frac{N_p}{N_s} = \frac{1}{30}NsNp=301
VpVs=30\frac{V_p}{V_s} = 30VsVp=30 and NpNs=130\frac{N_p}{N_s} = \frac{1}{30}NsNp=301