Thevenin's Theorem Flashcards
States that a linear two-terminal circuit can be replaced by an equivalent circuit consisting of a voltage source V_TH in series with a resistor R_TH.
Thevenin’s Theorem
It is the open voltage circuit at the terminals
V_TH or Thevenin’s Voltage
The input or equivalent resistance at the terminals when the independent sources are turned off.
R_TH or Thevenin’s Resistance
Thevenin’s Theorem was developed in what year?
1883
A French telegraph engineer who developed Thevenin’s Theorem?
Leon Thevenin
Formula: R_TH is the input resistance at the terminals when the independent sources are turned off.
R_TH = R_in
Formula: V_TH is the open-circuit voltage across the terminals.
V_TH = V_oc
Case 1 (Thevenin):
If the network has NO _________ sources, we turn off all _________ sources.
dependent, independent
Case 2:
If the network has ________ sources, we turn off all __________ sources.
dependent, independent
If the source is to be short-circuited, what will happen?
Zero value of the source
If the source is to be open-circuited, what will happen?
Remove the entire wire
As with _________, dependent sources are not to be turned off because they are controlled by circuit variables.
Superposition
Formula: R_TH or Thevenin’s Resistance
R_TH = Vo/Io
In either approach, we may assume ______ _________ of Vo and Io.
Any value
It often occurs that R_TH takes a __________ value.
Negative
In the case that R_TH takes a negative value, then the negative resistance (V = -IR) implies that the circuit is _________ power.
Supplying
Formula: Current load or I_L
I_L = V_TH/(R_TH + R_L)
Formula: Voltage load or V_L
V_L = (R_L)(I_L) = R_L(V_TH)/(R_TH + R_L)
