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U1=220V
U2=11V
N1=3000 zwojów
N2=?
N2/N1=U2/U1
N2=N1*U2/U1=3000*11V/220V=150 zwojów
2.
N1=500 zwojów
a) U2=3U1
N2/N1=U2/U1
N2/N1=3U1/U1=3
N2=3N1=3*500=1500 zwojów
b) 3U2=U1
N2/N1=U2/U1
N2/N1=U2/(3U2)=1/3
N2=(1/3)*N1=500/3=167 zwojów