## 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?

_{TH}if R1 is changed to 220 Ω?

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

_{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.

_{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.

_{TH}as seen by RL.