DC sweep was introduced in this Pspice lab, where node voltages and currents can be obtained with source that changes through a range of values, rather than staying constant as in nodal analysis.

 

In this circuit V1 had a DC sweep from 0-20V in 1-V increments. The graph above has its traces with the voltages with respect to current.

For more complicated circuits, Thevenin and Norton equivalents can be found for elements. In this case, a DC sweep graph was done at branch I2. With it being Voltage over Current, the resistance is the slope of the graph (around 6 ohms) and VTh is the zero intercept, which is 20V.

 The current source is then replaced with a voltage source to find the Norton equivalent. With the graph being Current vs Voltage, the slope of graph represent the inverse of resistance, conductance, with is around 0.17S. Zero y-intercept gives IN = 3.34A.

In the last circuit we graphed a chart of power. As expected, the power is maximum when the load resistance = the Thevenin Resistance, or in this case, when R is 1k.