Processing Math: Done
To print higher-resolution math symbols, click the
Hi-Res Fonts for Printing button on the jsMath control panel.

No jsMath TeX fonts found -- using image fonts instead.
These may be slow and might not print well.
Use the jsMath control panel to get additional information.
jsMath Control PanelHide this Message


jsMath

Lösning 4.4:1

FörberedandeFysik

(Skillnad mellan versioner)
Hoppa till: navigering, sök
Rad 1: Rad 1:
-
<math>U=230 V</math>, <math>P=50W</math>, <math>R=140\Omega</math> <math>Z=\sqrt{(R^2+\omega ^2 L^2)}</math> <math>\omega =314 rad/s</math> <math>(2\pi \cdot 50 = 314)</math><br\>
+
<math>U=230 V</math>, <math>P=50W</math>, <math>R=140\Omega</math> <math>Z=\sqrt{(R^2+\omega ^2 L^2)}</math><br\>
 +
<math>\omega =314 rad/s</math> <math>(2\pi \cdot 50 = 314)</math><br\>
<math>P=U\cdot I\cdot \cos\phi</math> <math>I=U/Z</math>
<math>P=U\cdot I\cdot \cos\phi</math> <math>I=U/Z</math>
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> <math>Z=384\Omega</math> <math>I=U/Z</math> <math>I=230/384=0,60A</math>
<math>50 = 230^2\cdot 140 = (140^2+314^2L^2)</math> <math>\Rightarrow L=1,14 H</math> <math>Z=384\Omega</math> <math>I=U/Z</math> <math>I=230/384=0,60A</math>

Versionen från 26 januari 2010 kl. 10.47

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