Problem 1.
In the circuit diagram shown currents $I_1$, $I_2$, and $I_3$ are unknown. Use the conventional direction
of currents shown when answering the questions below. No mesh analysis!
$I_1$
$I_2$
a
f
$\text{WWW}$
8.0 ?
$\text{WWW}$
6.0 ?
b
$I_3$
12 V
18 V
c
d
3.0 ?
A) Which side of the 8 ? resistor is at higher potential, a or f?
Why?
B) Write Kirchhoff's current law for node c.
C) Write Kirchhoff's voltage law for loops adefa and abcda
(clockwise).
D) Suppose that after solving for $I_1$, $I_2$, and $I_3$, you find $I_1$ =
-2A. Explain what this result means.
Problem 2.
In figure, $R_1$ = 5.00 ?, $R_2$ = 8.00 ?, and $R_3$ = 4.00 ?. The battery
has negligible internal resistance. The current $I_2$ through $R_2$ is
5.00 A.
A) What is the current $I_1$ through resistor $R_1$?
B) What is current $I_3$ through resistor $R_3$?
C) What is the emf of the battery?
$R_1$
$R_2$
$R_3$