Kirchoff’s Current Law (KCL). Popular form : the sum of currents entering the node is equal to the sum of currents leaving the node (charge cannot accumulate at a node). Drill: #7(a) p. 60 ( Graph of a circuit) #14(a) p. 61 (Circuit diagram)
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+
B
D
E
C
A
1 W
4 W
3 W
2 W
G = ref
5 W
6 W
Vin
Iin
= VAGVBG
= VAVB
+
B
A
C
R2
R1
G
R3
Vin
R3
R2
R1
Iin
A
G
IAB
A
+
Interconnected
Devices
VAB

B
 All devices are resistors: #22 p. 62
Im
Rm
+
Vmeas

R1
Im
Rm
+
+
+
Vmeas
Vo


R1
R1
R2
Im
G
Rm
Vin
+
Vmeas

Im
Rsh
Rm