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View All : Main > Topics > DC Circuits > Thèvenin Equivalents
diagram_thumbnail Problem 1

Two measurements are made on the same "linear mystery circuit" as shown. What would be the measured current Im if the 50-ohm resistor is replaced by a short circuit?

DC Circuits > Thèvenin Equivalents > Black Box Terminal Behavior
Keywords:
  • Black Box,
  • Resistor
,
  • Thèvenin Equivalents,
  • Resistor Combinations
Length: 3:40    Date Added: 2007-05-23 20:24:04    Filename: thev_box_ex1    ID: 83
diagram_thumbnail Problem 2

When the variable load resistance Rl is 1 kΩ the measured voltage Vm is 30 volts. When Rt is lowered to 10Ω the voltage drops to 3 volts. What would you expect Vm to be when the load resistance is removed?

DC Circuits > Thèvenin Equivalents > Black Box Terminal Behavior
Keywords:
  • Black Box,
  • Variable Resistor
,
  • Thèvenin Equivalents,
  • KVL
,
  • Algebra
Length: 4:06    Date Added: 2006-08-29 13:31:28    Filename: thev_box_ex2    ID: 84
diagram_thumbnail Problem 3

Consider the following experimental method to measure the Thèvenin resistance of a linear circuit:

(1) With the pushbutton open, measure and record Vm, (2) press the pushbutton and adjust Rvar until Vm is half the original voltage, and (3) release the pushbutton and measure Rvar.

Explain why the measured resistance Rvar is actually the same as the Thèvenin resistance Rt.

DC Circuits > Thèvenin Equivalents > Black Box Terminal Behavior
Keywords:
  • Black Box,
  • Variable Resistor,
  • Switch
,
  • Thèvenin Equivalents,
  • Voltage Divider
,
  • Algebra
Length: 5:12    Date Added: 2007-05-23 20:24:04    Filename: thev_box_ex3    ID: 87
diagram_thumbnail Problem 1

Find the Thèvenin equivalent circuit at the terminals S-T.

DC Circuits > Thèvenin Equivalents > Dependent Sources Exclusively
Keywords:
  • Dependent Voltage Source,
  • Resistor
,
  • Thèvenin Equivalents,
  • KVL,
  • KCL
,
  • Algebra
Length: 5:59    Date Added: 2007-05-23 20:24:04    Filename: thev_dep_ex1    ID: 88
diagram_thumbnail Problem 2

Find the Thèvenin equivalent circuit at the terminals U-V.

DC Circuits > Thèvenin Equivalents > Dependent Sources Exclusively
Keywords:
  • Dependent Voltage Source,
  • Resistor
,
  • Thèvenin Equivalents,
  • KVL,
  • KCL
,
  • Algebra
Length: 3:17    Date Added: 2007-05-23 20:24:04    Filename: thev_dep_ex2    ID: 89
diagram_thumbnail Problem 1

Find the Thèvenin equivalent at the terminals A-B. Use two different methods to find the Thèvenin resistance:

(a) As a ratio of short-circuit current and open-circuit voltage, and

(b) as the lookback resistance.

DC Circuits > Thèvenin Equivalents > Independent Sources
Keywords:
  • Independent Voltage Source,
  • Resistor
,
  • Thèvenin Equivalents,
  • Voltage Divider,
  • Resistor Combination,
  • Lookback Resistance
,
  • Algebra
Length: 5:09    Date Added: 2007-05-23 20:24:04    Filename: thev_ind_ex1    ID: 90
diagram_thumbnail Problem 2

Find the Thèvenin equivalent circuit to the left of the terminals A-B.

DC Circuits > Thèvenin Equivalents > Independent Sources
Keywords:
  • Independent Voltage Source,
  • Resistor
,
  • Thèvenin Equivalents,
  • Lookback Resistance
,
  • Algebra
Length: 2:38    Date Added: 2007-05-23 20:24:04    Filename: thev_ind_ex2    ID: 91
diagram_thumbnail Problem 3

Find the Thèvenin equivalent circuit at the terminals A-B.

DC Circuits > Thèvenin Equivalents > Independent Sources
Keywords:
  • Independent Current Source,
  • Resistor
,
  • Thèvenin Equivalents,
  • Lookback Resistance,
  • Resistor Combinations,
  • Current Divider
,
  • Algebra
Length: 4:52    Date Added: 2007-05-23 20:24:04    Filename: thev_ind_ex3    ID: 92
diagram_thumbnail Problem 4

Find the Thèvenin equivalent circuit at the terminals E-F.

DC Circuits > Thèvenin Equivalents > Independent Sources
Keywords:
  • Independent Current Source,
  • Resistor,
  • Independent Voltage Source
,
  • Thèvenin Equivalents,
  • Lookback Resistance,
  • Resistor Combinations,
  • Superposition,
  • Delta-Wye Conversion,
  • Current Divider
,
  • Algebra
Length: 8:34    Date Added: 2007-05-23 20:24:04    Filename: thev_ind_ex4    ID: 93
diagram_thumbnail Problem 1

Find the Thèvenin equivalent circuit at the terminals G-H.

DC Circuits > Thèvenin Equivalents > Independent and Dependent Sources
Keywords:
  • Independent Current Source,
  • Resistor,
  • Independent Voltage Source
,
  • Thèvenin Equivalents,
  • KVL
,
  • Algebra
Length: 5:52    Date Added: 2007-05-23 20:24:04    Filename: thev_inddep_ex1    ID: 94