Basic DC Theory
DC CIRCUIT ANALYSIS
Substitute these equations for I1, I2, and I3 into Kirchhoffs current equation (2-20) yields the
following.
VN
R2
VA
VN
R1
VB
VN
R3
The circuit shown in Figure 45 can be solved for voltages and currents by using the node-voltage
analysis.
First, assume direction of current flow shown. Mark nodes A, B, C, and N, and mark the
Figure 45 Node - Voltage Analysis
polarity across each resistor.
Second, using Kirchhoffs current law at Node N, solve for VN.
I3
I1
I2
VN
R2
VA
VN
R1
VB
VN
R3
VN
6
60
VN
8
20
VN
4
Rev. 0
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