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Lösning 4.4:1

Version från den 26 januari 2010 kl. 10.47; Lena Chytraeus (Diskussion | bidrag)

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

P=UIcos I=UZ

och cos=RIZI=RZP=U2RZ2

50=2302140=(1402+3142L2) L=114H

Z=384 I=UZ I=230384=060A