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|$\quad$|$R_{I}^0=\frac{U_I}{I_p}$  |
|  |$\quad$|
|$\quad\quad\quad$|$\quad\quad\quad\quad\quad\quad\quad\quad\quad\quad\quad$|
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|$\quad$|$R_{I}^0=\frac{U_I}{\color{blue}{I_p}}$  |
|  |with $I_p$ from $R_D=\frac{U_D}{I_p}$|
|$\quad\quad\quad$|$\quad\quad\quad\quad\quad\quad\quad\quad\quad\quad\quad$|
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|$\quad$|$R_{I}^0=\frac{U_I\cdot \color{blue}{R_D}}{\color{blue}{U_D}}$  |
|  |$\quad$|
|$\quad\quad\quad$|$\quad\quad\quad\quad\quad\quad\quad\quad\quad\quad\quad$|
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|$\quad$|$R_{I}^0=\frac{U_I\cdot R_D}{\color{blue}{U_D}}$  |
|  |with  $U_D = \frac{U_O}{A_D}$|
|$\quad\quad\quad$|$\quad\quad\quad\quad\quad\quad\quad\quad\quad\quad\quad$|
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|$\quad$|$R_{I}^0=\frac{U_I\cdot R_D \cdot \color{blue}{A_D}}{\color{blue}{U_O}}$  |
|  |reshaped|
|$\quad\quad\quad$|$\quad\quad\quad\quad\quad\quad\quad\quad\quad\quad\quad$|
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| $\quad$                                | $R_{I}^0=\frac{U_I}{U_O}\cdot R_D \cdot A_D$               |
|  | $\quad$                                                                   |
|$\quad\quad\quad$|$\quad\quad\quad\quad\quad\quad\quad\quad\quad\quad\quad$|
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|$\quad$|$R_{I}^0=\color{blue}{\frac{U_I}{U_O}}\cdot R_D \cdot A_D$  |
|  | with $A_V = \frac{U_O}{U_I} =\frac{R_2}{R_1+R_2}$|
|$\quad\quad\quad$|$\quad\quad\quad\quad\quad\quad\quad\quad\quad\quad\quad$|
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|$\quad$|$R_{I}^0={{1}\over{A_V}}\cdot R_D \cdot A_D$  |
|  | |
|$\quad\quad\quad$|$\quad\quad\quad\quad\quad\quad\quad\quad\quad\quad\quad$|
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|$\quad$|$R_{I}^0={{A_D}\over{A_V}}\cdot R_D $  |
|  | |
|$\quad\quad\quad$|$\quad\quad\quad\quad\quad\quad\quad\quad\quad\quad\quad$|
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