## Answer & Solution

**Option C**

21.

The Norton equivalent current is

22.

Norton's theorem provides a method for the reduction of any ac circuit to an equivalent form consisting of an equivalent voltage source in series with an equivalent impedance.

23.

Thevenin's theorem provides a method for the reduction of any ac circuit to an equivalent form consisting of an equivalent current source in parallel with an equivalent impedance.

24.

The Thevenin equivalent voltage is

25.

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

26.

Norton's theorem gives

27.

Referring to the given circuit, what is Z_{TH} if R1 is changed to 220 Ω?

28.

Determine V_{TH} if R1 is changed to 3.3 kΩ.

29.

Referring to the given figure, determine Z_{TH} as seen by RL if R1 is changed to 3.3 kΩ.

30.

Referring to the given circuit, determine Z_{TH} as seen by RL.