ELEC153 Circuit Theory II
Please provide detailed solutions to the following questions. Remember to show all your
work leading to your answers. Submit your detailed solutions by the posted due date.
Question 1
Use superposition principle to determine the current through the capacitance in the below
circuit:
Question 2
Find the Thevenin equivalent circuit for the portion of the network external to the
inductor between points a and b in the circuit below.
Question 3
Find the power in each component in this circuit:
1
Question 4
Find the resonant frequency, Q, and upper half-power frequency for this LCR circuit:
Question 5
Design an R-C low-pass filter to have a cut-off frequency 𝑓𝑐 of 500 Hz using a resistor of
1.2 kΩ. Find the voltage gains 𝐴𝑣 = 𝑣0 /𝑣𝑖 at 𝑓 = 0.1 𝑓𝑐 and 𝑓 = 10 𝑓𝑐 .
Question 6
Determine the following with respect to the 3-phase system shown below:
(a) Magnitude of phase voltage of the source.
(b) Magnitude of phase current of the source.
(c) If the total load active power is 1200 kW, find the total active power delivered by the
source.
2