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What is a phasor ? What is its use in a.c. circuit ? Draw a phasor diagram for pure resistive a.c. circuit. |
Answer» Solution : A phasor is a vector which ROTATES about the origin with angular speed `omega` . Notion of phasors is used for voltage and current in an a.c. circuit to SHOW phase relationship between them. The amplitudes of phasors `vecV` and `vecl`. represent the peak values `V_(m)`and `I_(m)`of these oscillating quantities. The vertical components of phasors V and I represent the INSTANTANEOUS values of FIG. 7.14 voltage and current respectively. Phasor diagram for a pure resistive a.c. circuit has been shown in Fig. 7.14. Here, V and I are in same phase. |
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