A.  $\frac{U}{U_0}-\frac{I}{I_0}=0$

B. $\frac{U}{U_0}+\frac{I}{I_0}=\sqrt{2}$

C.  $\frac{u}{ U}-\frac{i}{I}=0$

D.  $\frac{u^2}{{U_0}^2}+\frac{i^2}{{I_0}^2}=1$

A. $\frac{{\mathrm{u}}^2}{{\mathrm{U}}_0^2}+\frac{{\mathrm{i}}^2}{{\mathrm{I}}_0^2}=1.$

B. $\frac{\mathrm{U}}{{\mathrm{U}}_0}-\frac{\mathrm{I}}{{\mathrm{I}}_0}=0.$

C. $\frac{\mathrm{U}}{{\mathrm{U}}_0}+\frac{\mathrm{I}}{{\mathrm{I}}_0}=\sqrt{2}.$

D. ${\left(\frac{\mathrm{u}}{\mathrm{U}}\right)}^2+{\left(\frac{\mathrm{i}}{\mathrm{I}}\right)}^2=4.$

A.  $\frac{\mathrm{U}}{{\mathrm{U}}_0}-\frac{\mathrm{I}}{{\mathrm{I}}_0}=0$

B.  $\frac{\mathrm{U}}{{\mathrm{U}}_0}+\frac{\mathrm{I}}{{\mathrm{I}}_0}=\sqrt{2}$

C.  $\frac{\mathrm{u}}{\mathrm{U}}-\frac{\mathrm{i}}{\mathrm{I}}=0$

D.  $\frac{{\mathrm{u}}^2}{{\mathrm{U}}_0^2}-\frac{{\mathrm{i}}^2}{{\mathrm{I}}_0^2}=1$

A.  $\frac{U}{U_0}-\frac{I}{I_0}=0$

B.  $\frac{U^2}{U_0^2}+\frac{I^2}{I_0^2}=1$

C.  $\frac{u^2}{U_0^2}+\frac{i^2}{I_0^2}=1$

D.  $\frac{u}{U_0}-\frac{i}{I_0}=0$

A.  $\frac{u}{U_0}-\frac{i}{I_0}=0$

B.  $\frac{U^2}{{U_0}^2}-\frac{I^2}{{I_0}^2}=0$

C.  $\frac{U}{U_0}-\frac{I}{I_0}=0$

D.  $\frac{u^2}{{U_0}^2}-\frac{i^2}{{I_0}^2}=0$

A.  ${\left(\frac{u_L}{Z_L}\right)}^2+\left(\frac{u_R}{R}\right)=I^2$

B.  $I=\frac{U_0}{\sqrt{2\left(R^2+{Z_L}^2\right)}}$

C.  $\cos \phi =\frac{R}{\sqrt{R^2+{Z_L}^2}}$

D.  ${u_L}^2+i^2{Z_L}^2=I_0{Z_L}^2$

A.  $\frac{U}{U_0}-\frac{I}{I_0}=0$

B. $\frac{u^2}{{U_0}^2}-\frac{i^2}{{I_0}^2}=0$

C.  $\frac{u^2}{{U_0}^2}+\frac{i^2}{{I_0}^2}=2$

D.  $\frac{U}{U_0}+\frac{I}{I_0}=\sqrt{2}$

A.  $\frac{U}{U_0}-\frac{I}{I_0}=0$

B.  $\frac{u^2}{U_0^2}-\frac{i^2}{I_0^2}=0$

C.  $\frac{u^2}{U^2}+\frac{i^2}{I^2}=2$

D.  $\frac{U}{U_0}+\frac{I}{I_0}=\sqrt{2}$

$\mathit{A}\mathbf{.}\frac{U}{U_0}-\frac{I}{I_0}=0$

$\mathit{B}.\frac{U}{U_0}+\frac{I}{I_0}=\sqrt{2}$

$\mathit{C}\mathbf{.}\frac{u}{U}-\frac{i}{I}=0$

$\mathit{D}.\frac{u^2}{{U_0}^2}+\frac{i^2}{{I_0}^2}=1$