Method of (Circuit) Analysis

Methods for two or more souces 
Branch-current Analysis
Mesh analysis and
Nodal analysis
All the methods will be described for linear bilateral networks only

1. Liner indicates that the characteristics of the of the network elements are independent of voltage across or current through them.
   
2. e. g. Resistor
   
3. A 10kΩ resistor always shows 10kΩ whether the voltage across it is 10V or 100V

So resistor is a linear element but diode is not. 

Bilateral: it refers to the fact that there is no change in the behavior or characteristics of an element if the current through or voltage across the element is reversed

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