Chapter 5 (Dorf & Svoboda)
Chapter 5 (Dorf & Svoboda)
Vocabulary & Concepts
Ideal -vs- Practical Voltage Source
An ideal voltage source is independent of the current through it.
A (more) practical voltage source is modeled by an ideal voltage source in series with a resistor. This more closely approximates “real” voltage sources.
Ideal -vs- Practical Current Source
An ideal current source is independent of the voltage across it.
A (more) practical current source is modeled by an ideal current source in parallel with a resistor. This more closely approximates “real” current sources.
Source Transformations
Two sources are equivalent if they produce identical values of voltage and current when connected to identical values of a load resistance. An practical current source can be shown to be equivalent to a practical voltage source. Hence we can transform one into the other by a source transformation.
Dual Circuits
Two circuits in which currents and voltages, resistances and conductances, series and parallel are interchanged. Once a circuit is analyzed, its dual is also known. If the values are the same it is called an exact dual.
Superposition
In any linear resistive circuit containing several sources, the current (or voltage) at any point can be obtained by adding the individual currents (or voltages) caused by each independent source acting alone. (i.e. all other sources are set to zero: a voltage source becomes a short circuit and a current source becomes an open circuit.)
Thevenin’s Theorem
Any complex linear resistive circuit can be replaced by an equivalent network containing only an independent voltage source and a single resistor in series with it.
Norton’s Theorem
Any complex linear resistive circuit can be replaced by an equivalent network containing only an independent current source and a single resistor in parallel with it.
Maximum Power Transfer Theorem
This theorem says that for an independent voltage source in series with an internal resistance, Rs, maximum power is delivered to a load resistance, RL, when Rs = RL.
Alternatively, the theorem says that for an independent current source in parallel with an internal resistance, Rs, maximum power is delivered to a load resistance, RL, when Rs = RL.
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