This document introduces key concepts in electrical circuits including complex and polar forms of representation, phase representation of real and imaginary terms, the 'J' and 'a' operators, the relation between voltage and current in resistors, inductors and capacitors, equivalent circuits, network elements, types of sources, Kirchhoff's laws, nodal analysis and mesh analysis, the relation between impedance and admittance, practical and ideal sources, source transformation, and the power triangle.

2. INTRODUCTION TO ELECTRICAL CIRCUITS

3. Complex and Polar Forms of Representation

7. Phase Representation of
Real & Imaginary Terms

25. ‘J’ Operator

30. ‘a’ Operator

33. Relation between
Voltage & Current in R, L, & C

44. Equivalent Circuits

62. Network Elements

70. Types of Sources

74. Kirchhoff’s Laws

113. Nodal Analysis & Mesh Analysis

117. Relation between
Impedance (Z) and Admittance (Y)

121. Practical Sources & Ideal Sources

124. Source Transformation

129. Power Triangle