A transformer whose efficiency is 90%, draws 5 A when 200 V is applied to its primary coil. If output is drawn at 300 V, what is the current in secondary coil ? If number of turns in primary coil is 500, what is the number of turns in secondary coil?

A transformer whose efficiency is 90%, draws 5 A when 200 V is applied

1.	A transformer whose efficiency is 90%, draws 5 A when 200 V is applied to its primary coil. If output is drawn at 300 V, what is the current in secondary coil ? If number of turns in primary coil is 500, what is the number of turns in secondary coil?
Answer» Here,`eta = 90%, I_(P) = 5 A, E_(P) = 200 V` `I_(s) = ? E_(s) = 300 V, N_(P) = 500, N_(s) = ?` As `eta = (E_(s) I_(s))/(E_(P) I_(P))` `:. I_(s) = (eta E_(P) I_(P))/(E_(s)) = (90)/(100) xx (200 xx 5)/(300) = 3 A` From `(E_(s))/(E_(P)) = (N_(s))/(N_(P))` `N_(s) = (E_(s))/(E_(P)) xx N_(P) = (300)/(200) xx 500 = 750`

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A transformer whose efficiency is 90%, draws 5 A when 200 V is applied to its primary coil. If output is drawn at 300 V, what is the current in secondary coil ? If number of turns in primary coil is 500, what is the number of turns in secondary coil?

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