ElectroMagnetic InductionMedium
Question
For an LCR series circuit, phosphors of current i and applied voltage V = V0 sinωt are shown in diagram at t = 0. Which of the following is/are CORRECT ?
Options
A.At t = 
, instantaneous power supplied by source is negative.
, instantaneous power supplied by source is negative.B.From 0 < t < 
, average power supplied by source is positive.
, average power supplied by source is positive.C.At t = 
, instantaneous power supplied by source is negative.
, instantaneous power supplied by source is negative.D.If ω is increased slightly, angle between the two phosphors decreases.
Solution
The graph shows V & I as function of time. Current leads the voltage by π/3
Power is positive if V & I are of same sign. Power is negative if V & I are of opposite sign
If ω ↑ ⇒
thus angle decreases.
Power is positive if V & I are of same sign. Power is negative if V & I are of opposite sign
If ω ↑ ⇒
thus angle decreases.Create a free account to view solution
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