hệ số công suất

N

nguyentinhtk22

I

_iniesta_

[TEX] U_r ^2 + U_L ^2 = U^2[/TEX]
[TEX] U_C ^2 = U^2[/TEX]
[TEX] U_{AB} = U^2 = U_r ^2 + (U_L - U_C)^2 = U_r ^2 + U_L ^2 + U_C ^2 - 2U_L U_C --> U_C ^2 - 2 U_L U_C = 0 --> U_L = \frac{U_C}{2} = \frac{U}{2}[/TEX]
--> [TEX] U_r = \frac{ U \sqrt{3}}{2 }[/TEX]
[TEX] cos = \frac{U_r}{U }[/TEX]
 
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