Introduction to alternating current circuits, Sinusoidal functions: Instantaneous current, voltage, power effective current and voltage, average power, phasors and complex quantities, impedance, real and reactive power, power factor. Analysis of single phase AC circuits: Series and parallel RL, RC and RLC circuits, nodal and mesh analysis, application of network theorems in AC circuits. Resonance in AC circuits: Series and parallel resonance. Circuits with non-sinusoidal excitations. Transients: Transient condition in AC circuits, passive filters. Coupled circuits: Self and mutual inductances, coupling coefficient for both conductively and magnetically coupled circuits. Analysis of Poly phase circuits: Three phase supply, balanced and unbalanced circuits, Phase sequence, method of checking phase sequence, power calculations and measurement