Alternating current (AC), varying sinusoidally at 50 Hz in Europe and Asia and 60 Hz in North America and Japan, is the dominant form of electric power. AC provides the continuously changing magnetic flux linkage needed for electrical transformation. Transformation allows transmission at high voltage and low current, reducing resistive loss with step-down transformers near the point of use. Complex impedances are an efficient method for deriving the transfer function of an electric circuit. Analysis of AC circuits is an application of frequency response. Phasors are vectors in the complex resistance–reactance plane, which can represent either variables or operators. As variables, phasors are analogous to complex exponentials except that their amplitude is the root-mean-squared value rather than the peak amplitude of the sinusoid. As operators, they are analogous to transfer functions.
KeywordsAlternate Current Induction Motor Complex Impedance Neutral Line Flux Linkage
Reference and Suggested Reading
- Chapman SJ (2005) Electric machinery fundamental, 4th edn. McGraw-Hill, New YorkGoogle Scholar
- Fitzgerald AE, Higginbotham DE, Grabel A (1981) Basic electrical engineering. McGraw-Hill, New YorkGoogle Scholar
- Fitzgerald AE, Kingsley C, Umans SD (2003) Electric machinery, 6th edn. McGraw-Hill, New YorkGoogle Scholar