P eff

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<math>P_Template:Eff=\sum_{i=0}^n U_i * I_i *\cos \varphi_i</math>


<math>I\,\cos \varphi_i</math>

<math> \varphi_i = winkel\ zwischen\ U_i\ und\ I_i</math>

<math>I\,\cos \varphi</math> des Stroms<math>I\,</math>