Question

82 AB R2 R1 ww- VB Isie VAB R3 EVsig 81 VB 3 In this circuit, Vsig = 26 V, R1 = 52, R2 = 7 2, and R3 2. Use the Node Voltage method to solve the circuit: The nodes, voltages, and currents have been already labeled for you. For each node, write the KCL equation, sum of currents 0. Follow this convention : PLUS currents coming in, MINUS currents going out. For each resistor, write Ohm's Law and solve for the current in terms of node voltages. Substitute these currents into all KCL equations. Write information you have about the sources. In this case, you know that VA Vsig You ended up with 3 equations (2 KCL and one about the voltage source) and 3 unknowns (VA,VB, Isig) Solve for (VA, VB, Isig)

Answer 1

Given circit in www VA tVa VA Apply KCL node We have, Ohm's law VA VB + Uring R2 R3 Vig-VB RI where, 26- VB RI Subsh ture in , 26-Ve Ve + R7 RI "(3 ) न ) 26-VB V6 + 17 55 20 + 7 + 15x7 26 VA= 35+21t 15 21x2 VB 4.69 Volk Va= .69 Vo l

26-VA Theo RI 26-3.69 3.64A Then, VA sig P 26 Volts Naw VAG 26-7-69 IAe 3.67A R) VB 4.60 2.57 A R3 3 F.69 1-098 A R2 d T