or
or
If the switch in the following circuit opens at t = 0, find v(t) for t≥ 0 and the initial energy stored in the capacitor.
For t<0, the switch is closed.
Capacitor acts as open to DC.
Voltage across the capacitor,
v(0-)= {(12||4)×V}÷{(12||4)+6} = 8VFor t=0, the switch is opened,Voltage across the Capacitor cannot change instantaneously,So, v(0-)= v(0) = 8VAt t>0, The capacitor is discharging.Rth = (12||4) = 3 ohmC= 1/6 FTime constant, Π = Rth×C = 0.5 So, v(t) = v(0)e-t/Π = 8e-t/0.5 =8e-2t V (Ans.)
Find currents I and I1 in the following circuit.
Determine the Thevenin's equivalent circuit at terminal X-Y of the following circuit.
Show that a series RL circuit is a low pass filter if the output is taken across the resistor. Calculate the cut-off frequency (fc) if L = 2 mH and R = 10 kΩ.
Compute the average and effective values of the square voltage wave shown in the following figure.
Define voltage regulation of a transformer. A 11000/230V, 150 kVA single phase, 50 Hz transformer has cure loss of 1-4 kW and full load cu loss of: 1.6 kW. Determine-
(i) the kVA load for maximum efficiency and value of maximum efficiency at unity power factor.
(ii) the efficiency at half F.L. (full load) and 0-8 power factor (leading).
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