DC CIRCUIT ANALYSIS
Basic DC Theory
Clear the fraction so that we have a common denominator:
Third, find all voltage drops and currents.
The negative value for V3 shows that the current flow through R3 is opposite that which was
assumed and that the polarity across R3 is reversed.
The negative value for I3 shows that the current flow through R3 is opposite that which was
Series-Parallel Circuit Analysis
When solving for voltage, current, and resistance in a series-parallel circuit, follow the rules
which apply to the series part of the circuit, and follow the rules which apply to the parallel part
of the circuit. Solving these circuits can be simplified by reducing the circuit to a single
equivalent resistance circuit, and redrawing the circuit in simplified form. The circuit is then
called an equivalent circuit (Figure 46).