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n2 - liczba zwojów uzwojenia wtórnego = 400 zwojów
n = ? - przekładnia transformatora
Robc = 20 Ohm
Iobc = 0,2A
Uobc = U2 = ?
U1 = ?
n = n1/n2
n = 2000/400 = 5
U2 = Iobc * Robc
U2 = 4V
U1/U2 = n => U1 = n * U2
U1 = 5 * 4 = 20V