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Unit 11: Circuit Theorems

When you’re trying to analyze complicated circuits, a few tricks of the trade can greatly simplify your task. In this unit and the next one we’ll learn some of those tricks. The two main topics in this unit are source conversions and the superposition theorem. Source conversions let you replace a voltage source with a current source, or vice versa. In some cases, this can make a particular circuit easier to analyze. The superposition theorem tells you how to attack circuits that have more than one source–such as a circuit containing two voltage sources, or a circuit containing a voltage source and a current source.

This material is not easy to learn, so take it slow, and do plenty of practice problems to learn these techniques. These problems can be pretty challenging, and here’s where you really find out how well you learned the material in earlier units (such as Kirchhoff’s laws, the divider rules, and so on).

Unit 10 Review

Ideal DC Voltage Sources
Practical Voltage Sources
Internal Resistance of a Voltage Source 

Ideal Current Source
Practical Current Sources
Internal Resistance of a Current Source 

Source Conversions
Converting a Voltage Source to a Current Source
Converting a Current Source to a Voltage Source

Superposition Theorem
Removing Voltage Sources or Current Sources
Superposition Principle: Step-by-Step

Unit 11 Review

Congratulations! You’ve completed the e-Lesson for this unit.