estia-1a/Électrotechnique/Index.md

1.

!1 Cours Electromagn 2026.pdf

2.

!2 Cours Transformateur 2026.pdf

Exercice 1.1:

!

1.

R=0.5\Omega/km\times1.5km\times2 (\times2 car il y a deux cables) R=1.5\Omega.

V_1=RI+V_{R}e V_1=1.5\Omega\,150A+230V=455.5V

2.

P=V_RI=RII=RI^2 P=1.5\times150^2=33.75kW

3.

\frac{n_2}{n_1}=\frac{V_2}{V_1}=\frac{1}{25}=\frac{I_1}{I_2}\implies I_1=\frac{I_2}{25}=6A P_R=RI_1^2=1.5\times6^2=54kW

4.

V_1=25V_2=25\times230=5750V V_{1P}=V_1+RI_1=5750V+1.5\times6 V_{1P}=5759V \frac{V_{1P}}{V_P}=m\implies V_P=\frac{V_{1P}}{m}=\frac{5759}{25}=230.36V

Exercice 1.2:

!

1.