Benutzer:Defqon

$R_{12}={\frac {1}{2\cdot \pi \cdot \sigma \cdot h}}\cdot ln({\frac {r_{2}}{r_{1}}})$

$U_{12}=R_{12}\cdot I$

$S_{(r)}={\frac {I}{2\cdot \pi \cdot r\cdot h}}$

${\frac {S_{1}}{S_{2}}}={\frac {\sigma _{1}}{\sigma _{2}}}$

$S_{(r)}={\frac {I}{4\pi r^{2}}}$

$U={\frac {I}{4\pi \sigma }}\cdot ({\frac {1}{r_{i}}}-{\frac {1}{r_{a}}})$

$R={\frac {1}{4\pi \sigma }}\cdot ({\frac {1}{r_{i}}}-{\frac {1}{r_{a}}})$

$U_{12}={\frac {Q}{4\pi \epsilon }}\cdot ({\frac {1}{r_{1}}}-{\frac {1}{r_{2}}})$

$Q=D\cdot A$

$Q=D\cdot 4\pi \cdot R^{2}\cdot$

$E_{durchschlag}={\frac {U_{durchschlag}}{d}}$

$S={\frac {U_{durchschlag}}{U_{betrieb}}}$

$D_{(r)}={\frac {Q}{4\pi r^{1}}}$

$E_{(r)}={\frac {Q}{4\pi \epsilon r^{2}}}$

$E={\frac {U}{D}}$

$D=\epsilon \cdot E=\epsilon \cdot {\frac {A}{d}}U$

$Q=\epsilon {\frac {A}{d}}U$

$D_{(r)}={\frac {Q}{2\pi rl}}$

$E_{(r)}={\frac {D_{(r)}}{\epsilon }}={\frac {Q}{2\pi \epsilon +l}}$

$U_{12}={\frac {Q}{2\pi \epsilon l}}$

$D_{max}=D_{r1}=\epsilon {\frac {r_{2}U}{r_{1}\cdot (r_{2}-r_{1})}}$

$Q=D_{max}4\pi r_{1}^{2}=4\pi \epsilon {\frac {r_{2}r_{1}}{r_{2}-r_{1}}}$

$Q=C\cdot U={\frac {4\pi \epsilon r_{1}r_{2}}{r_{2}-r_{1}}}$

$Q_{1}=-Q_{2}$

$D_{1}=D_{2}$

$\epsilon _{0}\epsilon _{r1}E_{1}=\epsilon _{0}\epsilon _{r2}E_{2}$