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Lösning 4.4:1

FörberedandeFysik

(Skillnad mellan versioner)
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Rad 6: Rad 6:
och <math>\cos\phi = R\cdot I/Z\cdot I = R/Z \Rightarrow P=U^2\cdot R/Z^2</math><br\>
och <math>\cos\phi = R\cdot I/Z\cdot I = R/Z \Rightarrow P=U^2\cdot R/Z^2</math><br\>
-
<math>50 = 230^2\cdot 140 = (140^2+314^2L^2)</math> <math>\Rightarrow L=1,14 H</math><br\>
+
<math>50 = 230^2\cdot 140 /(140^2+314^2L^2)</math> <math>\Rightarrow L=1,14 H</math><br\>
<math>Z=384\Omega</math> <math>I=U/Z</math> <math>I=230/384=0,60A</math>
<math>Z=384\Omega</math> <math>I=U/Z</math> <math>I=230/384=0,60A</math>

Versionen från 26 januari 2010 kl. 10.49

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