First slide
Phasors and Phasor Diagrams

A series R-C circuit is connected to an alternating voltage source. Consider two situations:
(a) When capacitor is air filled.
(b) When capacitor is mica filled. Current through resistor is i and voltage across capacitor is V then


 Current through resistor, i


= Current in the circuit 


 Voltage across capacitor, V=iXC


 As Ca<Cb

  ia<ib and Va>Vb


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