Determine the Thevenin's equivalent circuit at terminal X-Y of the following circuit.

Find currents I and I₁ in the following circuit.

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.

Show that a series RL circuit is a low pass filter if the output is taken across the resistor. Calculate the cut-off frequency (f_c) 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).