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Lösning 4.4:1

Version från den 22 januari 2010 kl. 13.52; Lena Chytraeus (Diskussion | bidrag)

U=230V, P=50W, R=140 Z=(R2+2L2) =314rads (250=314)

P=UIcos I=UZ

och \cos\phi = R\cdot I/Z\cdot I = R/Z \Rightarrow P=U2ÁR=Z2 50=2302Á140=(1402+3142L2)=)L=1;14HZ=384ÊI=U=ZI=230=384=0;60A