Electrical Engineering ⇒ Topic : Applications of Phasor Algebra to A.C. Circuits
Applications of Phasor Algebra to A.C. Circuits
We know that alternating voltages and currents are phasor quantities. Therefore, they can be expressed in the complex form e.g. rectangular, trigonometrical or polar form. The magnitude and phase angle of voltage or current can be readily obtained from its complex form. We shall now see how phasor algebra applied to a.c. circuits yields quick solution. While applying phasor algebra to a.c. circuits, the following points must be kept in mind
(1) If circuit current is taken as the reference phasor (i.e. along OX-axis), then,
I = I + j 0
It is because phasor lying along OX-axis has nof part.
(2) If voltage is taken as the reference phasor (i. e. along OX-axis), then,
V = V + j 0
(3) The angles of voltage or current are measured from OX-axis which is taken as the axis of reference. If the angle is measured in CCW direction from OX-axis, then it is considered a positive angle. If measurement is made in clockwise direction from OX-axis, the angle is considered negative.
(4) Magnitudes of phasors (current or voltage) mean the r.m.s. values unless stated otherwise
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