The Circuit Shown Below,
(A) Write a Node $a$

Essay

the circuit shown below,
(a) Write a node equation at node 1 by summing the currents leaving node 1 .
(b) Write a node equation at node 2 by summing the currents leaving node 2 .
(c) Solve the node equations to find the Thévenin equivalent voltage between $a$ and $b$ , $\mathrm { V } _ { \text {th } } = \mathrm { V } _ { 2 }$ .
(d) Find the Thévenin equivalent resistance between $a$ and $b$ .