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A power transmission line feeds input power at 2400 V to a step down transformer with its primary windings having 4000 turns. What should be the number of turns in the secondary windings in order to get output power at 240 V?

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In ideal transformer `P_("in") = P_(0)`
`V_(p) I_p = V_s I_s`
`(V_s)/(V_p) = (I_P)/(I_S) = (N_S)/(N_P) N_S ((V_S)/(V_P)) N_P = (240)/(2400) xx 4000 = 400`
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