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Lecture 5

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Lecture 5

Source Transformation

Thevenin Equivalent Circuit

Norton Equivalent Circuit

Show that iS=vS/R for any RL

Determine whether the 6V source is

absorbing or delivering the power.

Prove that the left circuit and the right circuit are

equivalent for any load resistor.

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

- 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

Show that VTH=vab

Determine the Thevenin Equivalent Voltage

Determine the short circuit current

Determine 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

- A Norton Equivalent circuit consists of
- Short-Circuit Current
- Norton Equivalent Resistance, which is equal to Thevenin Equivalent Resistance

Derive 4.1-4.3