56. Referring to the given circuit, find ZTH if VS is 18 ∠0° V.
(a) 9.82 ∠–51.3° kΩ
(b) 9.38 ∠–51.3° kΩ
(c) 180 ∠–38.3° kΩ
(d) 19.2 ∠–38.3° kΩ
57. Norton’s theorem gives ________.
(a) an equivalent current source in parallel with an equivalent impedance
(b) an equivalent current source in series with an equivalent impedance
(c) an equivalent voltage source in parallel with an equivalent impedance
(d) an equivalent voltage source in series with an equivalent impedance
58. Nota
59. If two currents are in the same direction at any instant of time in a given branch of a circuit, the net current at that instant ________.
(a) is zero
(b) is the sum of the two currents
(c) is the difference between the two currents
(d) cannot be determined
60. The two basic components of a Thevenin equivalent ac circuit are ________.
(a) the equivalent voltage source and the equivalent series impedance
(b) the equivalent voltage source and the equivalent series resistance
(c) the equivalent voltage source and the equivalent parallel impedance
(d) the equivalent voltage source and the equivalent parallel resistance
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