This line intersects the i-axis (v o) at i- 2.5/60 41 7 mA and intersects the v-axis (i 0) at v voc 2.5 V. Figure 3-49(b) superimposes the source circuit load line on the diode's 9 curve. The intersection (Q-point) is at i 15 mA and v vD 1.6 V. This is the point (9 at which both the source and diode device constraints are satisfied. Finally, the power delivered to the diode is