Page 41 - Schaum's Outline of Theory and Problems of Electric Circuits
P. 41
CIRCUIT LAWS
30
Fig. 3-8 [CHAP. 3
Fig. 3-9
The branch currents within the enclosed area cannot be calculated since no values of the resistors are
given. However, KCL applies to the network taken as a single node. Thus,
2:0 3:0 4:0 I ¼ 0 or I ¼ 5:0A
3.4 Find the equivalent resistance for the circuit shown in Fig. 3-10.
Fig. 3-10
The two 20-
resistors in parallel have an equivalent resistance R eq ¼½ð20Þð20Þ=ð20 þ 20Þ ¼ 10
. This
is in series with the 10-
resistor so that their sum is 20
. This in turn is in parallel with the other 20-
resistor so that the overall equivalent resistance is 10
.
3.5 Determine the equivalent inductance of the three parallel inductances shown in Fig. 3-11.
