THE STRATEGY FOR NODE ANALYSIS
1. IDENTIFY ALL NODES AND SELECT
   A REFERENCE NODE
2. IDENTIFY KNOWN NODE VOLTAGES
3. AT EACH NODE WITH UNKNOWN
   VOLTAGE WRITE A KCL EQUATION
(e.g.,SUM OF CURRENT LEAVING =0)
4. REPLACE CURRENTS IN TERMS OF
   NODE VOLTAGES
AND GET ALGEBRAIC EQUATIONS IN THE NODE VOLTAGES ...
REFERENCE
SHORTCUT: SKIP WRITING
THESE EQUATIONS...
AND PRACTICE WRITING
THESE DIRECTLY