Lösning 4.4:10
FörberedandeFysik
(Skillnad mellan versioner)
(Ny sida: <math>U = 230 V</math> <math>P = 500 W</math> R=17;1ÊP=UIÁcos¶cos¶=UR=UZ=RI=ZI=R=Z !=314rad=sU=IÁZP=UIÁR=Z=U2R=Z2500=2302Á17;1=Z2 Z=42;5Êcos¶=17;1=42;5=0;40Z=pR2+!2L242;5=p...) |
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(6 mellanliggande versioner visas inte.) | |||
Rad 1: | Rad 1: | ||
- | <math>U = 230 V</math> | + | <math>U = 230 \,\mathrm{V}</math>, <math>P = 500 \,\mathrm{W}</math>, <math>R = 17,1 \,\Omega</math><br\> |
- | + | ||
- | Z=42 | + | <math>P = UI\cdot \cos\phi</math>, <math>\cos\phi = U_R/U_Z = RI /ZI = R/Z </math><br\> |
- | L=0 | + | |
+ | <math>\omega = 314 \,\mathrm{rad/s}</math><br\> | ||
+ | |||
+ | <math>U = I\cdot Z</math>, <math>P=UI\cdot R/Z = U^2R/Z^2</math><br\> | ||
+ | |||
+ | <math>500 = 230^2 \cdot 17,1/Z^2</math><br\> | ||
+ | |||
+ | <math>Z = 42,5 \,\Omega</math>, <math>\cos\phi = 17,1/42,5 = 0,40</math><br\> | ||
+ | |||
+ | <math>Z = \sqrt{R^2 + \omega ^2 L^2}</math> | ||
+ | |||
+ | <math>42,5 = \sqrt{17,1^2 + 314^2L^2}</math><br\> | ||
+ | |||
+ | <math>L = 0,123 \,\mathrm{H}</math> |
Nuvarande version
\displaystyle U = 230 \,\mathrm{V}, \displaystyle P = 500 \,\mathrm{W}, \displaystyle R = 17,1 \,\Omega
\displaystyle P = UI\cdot \cos\phi, \displaystyle \cos\phi = U_R/U_Z = RI /ZI = R/Z
\displaystyle \omega = 314 \,\mathrm{rad/s}
\displaystyle U = I\cdot Z, \displaystyle P=UI\cdot R/Z = U^2R/Z^2
\displaystyle 500 = 230^2 \cdot 17,1/Z^2
\displaystyle Z = 42,5 \,\Omega, \displaystyle \cos\phi = 17,1/42,5 = 0,40
\displaystyle Z = \sqrt{R^2 + \omega ^2 L^2}
\displaystyle 42,5 = \sqrt{17,1^2 + 314^2L^2}
\displaystyle L = 0,123 \,\mathrm{H}