Conducteurs en série ou parallèle I

$(val20[1;]) , et . $(val20[2;]) $val12 $(val20[3;])
xrange 0,5 yrange 0,5 segment 1,2.8,1,2,black segment 1,2,1.3,2,black segment 2.1,2,2.9,2,black segment 3.7,2,4,2,black segment 4,2,4,4,black segment 4,4,2.9,4,black segment 2.1,4,1,4,black segment 1,4,1,3,black segment 0.5,3,1.5,3,black segment 0.8,2.8,1.2,2.8,black polyline black,2.1,4.1,2.9,4.1,2.9,3.9,2.1,3.9,2.1,4.1 segment black,1.3,1.9,2.1,1.9,2.1,2.1,1.3,2.1,1.3,1.9 polyline black,2.9,1.9,3.7,1.9,3.7,2.1,2.9,2.1,2.9,1.9 text red,2.4,4.5,medium,R1 text red,1.6,1.8,medium,R2 text red,3.2,1.8,medium,R3 xrange 0,5 yrange 0,5 polyline black,1,2.8,1,2,4,2,4,4,1,4,1,3 segment 2,2,2,2.6,black segment 2,3.4,2,4,black segment 3,2,3,2.6,black segment 3,3.4,3,4,black segment 4,2.6,4,3.4,white segment 0.5,3,1.5,3,black segment 0.8,2.8,1.2,2.8,black polyline black,1.9,2.6,1.9,3.4,2.1,3.4,2.1,2.6,1.9,2.6 polyline black,2.9,2.6,2.9,3.4,3.1,3.4,3.1,2.6,2.9,2.6 polyline black,3.9,2.6,3.9,3.4,4.1,3.4,4.1,2.6,3.9,2.6 text red,2.9,4.35,medium,R1 text red,1.8,1.8,medium,R2 text red,3.9,1.8,medium,R3
$val21 $val6 ohms, $val7 ohms, $val8 ohms. $(val22[1;]) $val9 V. $(val22[2;]) $val23 $val24
$val25

Conducteurs en série ou parallèle II

$val8 $val15 ohms, $val16 ohms, $val17 ohms, $val18 ohms. $(val9[1;]) $val21 $(val9[2;]) $val19 V.
xrange 0,5 yrange 0,5 segment 1,2.8,1,2,black segment 4,2,4,2.7,black segment 4,3.5,4,4,black segment 4,4,2.9,4,black segment 2.1,4,1,4,black segment 1,4,1,3,black segment 1,2.8,1,2,black segment 1,2,1.4,2,black segment 2.2,2,2.8,2,black segment 0.5,3,1.5,3,black segment 0.8,2.8,1.2,2.8,black segment 3.6,2,4,2,black polyline black,2.1,3.9,2.1,4.1,2.9,4.1,2.9,3.9,2.1,3.9 polyline black,1.4,1.9,1.4,2.1,2.2,2.1,2.2,1.9,1.4,1.9 polyline black,2.8,1.9,2.8,2.1,3.6,2.1,3.6,1.9,2.8,1.9 polyline black,3.9,2.7,4.1,2.7,4.1,3.5,3.9,3.5,3.9,2.7 \RR1 \RR2 \RR3 \RR4 text red,2.1,4.5,medium,$val15 text red,1.5,1.8,medium,$val16 text red,2.9,1.8,medium,$val17 text red,4.3,3.2,medium,$val18 xrange 0.5,6 yrange 1,6.5 polyline black,1,3.3,1,2,5,2,5,5,1,5,1,3.5 segment 2,2,2,3.1,black segment 2,3.9,2,5,black segment 3,2,3,3.1,black segment 3,3.9,3,5,black segment 4,2,4,3.1,black segment 4,3.9,4,5,black segment 5,2,5,3.1,black segment 5,3.9,5,5,black segment 0.5,3.5,1.5,3.5,black segment 0.8,3.3,1.2,3.3,black polyline black,1.9,3.1,2.1,3.1,2.1,3.9,1.9,3.9,1.9,3.1 polyline black,2.9,3.1,3.1,3.1,3.1,3.9,2.9,3.9,2.9,3.1 polyline black,3.9,3.1,4.1,3.1,4.1,3.9,3.9,3.9,3.9,3.1 polyline black,4.9,3.1,5.1,3.1,5.1,3.9,4.9,3.9,4.9,3.1 segment 5,3.1,5,3.9,white \RR1 \RR2 \RR3 \RR4 text red,4.7,2.8,medium,$val15 text red,1.7,2.8,medium,$val16 text red,2.7,2.8,medium,$val17 text red,3.7,2.8,medium,$val18
$val10 $(val11[1;]) $val22 ohms. $(val11[2;]) $(val11[3;1]). $(val11[3;2]).

Maille dans un circuit électrique

Voici une maille dans un circuit électrique alimenté en continu :
$val13 $val14
Quelle est la valeur du potentiel manquant ?
$val8

Noeud dans un circuit électrique

$(val7[1;]):
$val13
$(val7[2;])?
$val8