# 1.
![[1 Cours Electromagn 2026.pdf]]

# 2.
![[2 Cours Transformateur 2026.pdf]]

## Exercice 1.1:
![[Pasted image 20260413093212.png]]

### 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:
![[Pasted image 20260413100403.png]]
### 1.