The resistance of the device D in Figure P3.80 is a non-linear function of pressure P. The i -v characteristics of D are shown as a family of curves for various pressures.
Assume:
VS = 2.5V R = 125?
a. Plot the DC load line.
b. Plot the voltage across D as a function of pressure.
c. Determine the current through D when P = 30 psig.
Find:
The DC load line, the voltage across the device as a function of pressure, and the current through the nonlinear device when P = 30 psig.
Analysis:
Circuit characteristic [DC load line]:
The circuit characteristic is a linear relation. Plot the two intercepts and connect with a straight line to plot the DC load line. Solutions are at the intersections of the circuit with the device characteristics, i.e.:
The function is nonlinear. Reading from where the load line crosses the P = 30 psig:
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