In the analysis of an AC circuit, voltage and current phasors are used with resistances and reactances in much the same way that voltages and currents are used with resistances in the analysis electric circuit analysis pdf free download a DC circuit. The original ac circuit, called a time-domain circuit, is transformed into a phasor-domain circuit that has phasors instead of sinusoidal voltages and currents, and that has reactances instead of inductances and capacitances.

The phasor-domain circuit is the circuit that is actually analyzed. It has the advantage that the resistances and reactances have the same ohm unit and so can be combined similarly to the way that resistances can he combined in a DC circuit analysis. Also, the analysis of the phasor-domain circuit requires no calculus, but only complex algebra. Finally, all the DC circuit analysis concepts for finding voltages and currents apply to the analysis of a phasor-domain circuit. But, of course complex numbers are used instead of real numbers.

First, consider obtaining this relation for a resistor of R ohms. This result shows that the resistance R of a resistor relates the resistor voltage and current phasors in the same way that it relates the resistor voltage and current. R is represented in the original time-domain circuit. Get access to premium electrical guides, technical articles and much more! 2018 EEP – Electrical Engineering Portal.

The content is copyrighted to EEP and may not be reproduced on other websites. In TEFC motors, interior heat losses are dissipated indirectly through enclosure fins, mostly by forced air convection. Cutaway view through stator of TEFC induction motor, showing rotor with internal air circulation vanes. Three-phase squirrel-cage induction motors are widely used as industrial drives because they are rugged, reliable and economical. Single-phase induction motors are used extensively for smaller loads, such as household appliances like fans. In 1824, the French physicist François Arago formulated the existence of rotating magnetic fields, termed Arago’s rotations. By manually turning switches on and off, Walter Baily demonstrated this in 1879, effectively the first primitive induction motor.

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