This innovative introduction to circuit analysis helps readers develop a clearer understanding of the behavior of all components in a circuit by treating Direct Current as a special case of Alternating Current. It combines coverage of theorems and fundamental physical concepts where appropriate and reviews the particular mathematical techniques applicable to a specific analysis techniques in every case. Physical Electronics. Voltage and Current Sources: The Sinusoidal Waveform. Mathematical Background. Behavior of Circuit Elements. Steady State Analysis of Series and Parallel Circuits. Steady State Analysis of Series-Parallel Circuits. Formal Steady State Circuit Analysis Techniques and Theorems. Frequency Response of Common Circuits. Resonance. Magnetic Induction and Transformers. Power and Energy. Transient Analysis of Circuits. Physical Properties. Instrumentation and Lab Simulation. For anyone needing a solid introduction to circuit analysis.