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# Lecture 5 PowerPoint PPT Presentation

Lecture 5. Source Transformation Thevenin Equivalent Circuit Norton Equivalent Circuit. Source Transformation. Show that i S = v S /R for any R L. Application. Determine whether the 6V source is absorbing or delivering the power. Step-by-step simplification. Redundant Resistor (1).

Lecture 5

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## Lecture 5

Source Transformation

Thevenin Equivalent Circuit

Norton Equivalent Circuit

### Source Transformation

Show that iS=vS/R for any RL

### Application

Determine whether the 6V source is

absorbing or delivering the power.

### Redundant Resistor (1)

Prove that the left circuit and the right circuit are

### Redundant Resistor (2)

Prove that the left circuit and the right circuit are equivalent for any load resistor.

### VTh

• If RL=∞, then Vab=VTH

• If RL=0, the short circuit current from a to b (i.e. iab) should equal to isc=VTh/RTH.

• So RTH=VTh/isc

### Determine vab

Show that VTH=vab

### Example 4.10

Determine the Thevenin Equivalent Voltage

### Example 4.10

Determine the short circuit current

Determine RTH

### Methods of Finding RTH

• RTH=VTH/iSC

• If the network contains only independent soruces:

• Deactivate a voltage source by replacing it with a short

• Deactivate a current source by replacing it with an open

• If the network contains dependent sources

• Apply a test source

### Norton Equivalent Circuit

• A Norton Equivalent circuit consists of

• Short-Circuit Current

• Norton Equivalent Resistance, which is equal to Thevenin Equivalent Resistance

Derive 4.1-4.3