Question

4. Calculate the voltage, Vx across 100 ohm resistor. 100Ω 100 kΩ 10Ω 100Ω ΊΜΩ ΊΜΩ

Answer 1

From circuit = v^+ = 0 v from virtual Ground concept v^- = v^+ = 0 v Apply nodal analysis at node v^- v^- + s/10 + v^- - v_1/100 = 0 10(v^- + 5) + v^- - v_1/100 = 0 11 v^- - v_1 = -50 -v_1 = -50 v_1 = 50 v \r\n from circuit v_a^+ = 0 v Apply source transformation v_d = 93 ma) (1 k) v_d = 3 v Apply nodal analysis at v_a^- v_a^- - 3/20k + 1 k + v_a^- - v_2/100 k = 0 v_a^- - 3/21 k + v_a^- v_2/100 k = 0 100(v_a^- - 3) + 21 (v_a^- - v_2)/2100 k = 0 121 v_a^- - 21 v_2 = 300 121(0) - 21 v_2 = 300 v_2 = -1.285 v v_x = v_2 - v_2 = -14.285 - 50 v_x = -64.285 v