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An a.c. source, of voltage V =V_(m) sin omega t , is applied across a series LCR circuit. Draw the phasor diagram for the circuit when the (i) capacitive reactance exceeds the inductive reactance, (ii) inductive reactance exceeds the capacitive reactance. |
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Answer» Solution :(i) PHASOR diagram for the SERIES LCR a.c. circuit when capacitive REACTANCE `X_( c)` exceeds the inductive reactance `X_( L)` is shown in Fig. 7.22(a). Here voltage `VECV`lags behind the current `vecL`by a phase angle `phi`. (ii) The phasor diagram, when `X_(L) gt X_(C)`has been shown in Fig. 7.22(b). Here voltage `vecV`LEADS the current l by a phase angle 
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