A transformer has $N_p = 500$ turns and $N_s = 2500$ turns. It is $90\\%$ efficient ($\eta = 0.90$). If primary input power is $P_p = 1000\text{ W}$ at $V_p = 200\text{ V}$, what is the secondary voltage $V_s$ and secondary current $I_s$?

• A$V_s = 1000 ext{ V}, I_s = 0.90 ext{ A}$
• B$V_s = 1000 ext{ V}, I_s = 1.00 ext{ A}$
• C$V_s = 900 ext{ V}, I_s = 1.00 ext{ A}$
• D$V_s = 900 ext{ V}, I_s = 0.90 ext{ A}$

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