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Explain AC circuit for circuit with only resistor. |
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Answer» Solution :AC current through a resistor is in phase with voltage. But this is not so in the case of an inductor, a capicator or a combination of these circuit elements. In ORDER to show phase relationship between voltage and current by using notion of phasors. A phasor is a vector which rotates about the origin with angular speed `omega ` as shown in figure .  The vertical components of phasors V an dI are `V_(m) SIN omega t ` and `I_(m) sin omega t ` where `V_(m)` and `I_(m)` are oscillating quantities or INDICATES peak values. According to figure a resistor is CONNECTED with ac SOURCE.  Figure (a) showsthe voltage and current phasors and their relationship at time `t_(1)` corresponding to the circuit. The projection of V and I phasors on vertical axis are `V_(m) sin omega t_(1)` and `I_(m) sin omega t ` respectively represent the value of voltage and current at that instant. The rotating vectors with frequency `omega`is shown in figure (b) are generated. Phasors V and I for the case of resistor are in the same direction. This means that the phase angle between voltage and the current is zero. |
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