Network theorems Week of 8th September 2008.

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Presentation transcript:

Network theorems Week of 8th September 2008

Questions till the 1st In-sem exam

Thevenin’s Theorem Used to replace any linear circuit with an equivalent voltage source called VTH and an equivalent resistance called RTH

Thevenin Example Original Circuit

Thevenin’s theorem can be used to replace any linear circuit with an equivalent voltage source called VTH and an equivalent resistance called RTH. 6 kW 4 kW VTH 72 V RL 3 kW RTH Calculate or measure Thevenin’s resistance (RTH) Remove the source. Remove the load. Calculate or measure VTH across the open terminals.

Thevenin’s Voltage

Original circuit Thevenin equivalent circuit 6 kW 4 kW Original circuit 72 V RL 3 kW 6 kW (RTH) Thevenin equivalent circuit RL 24 V (VTH)

Norton’s Theorem Used to replace any linear circuit with an equivalent current source called IN and an equivalent resistance called RN

Norton’s Current IN = 4 mA RN = 6 KW

A Thevenin equivalent circuit The Norton dual 6 kW (RTH) A Thevenin equivalent circuit RL 24 V (VTH) VTH Circuit Conversion RN = RTH IN = RTH 6 kW (RN) RL 4 mA (IN) The Norton dual

Superposition Theorem

Circuit Theorems Refer Chapter 5 from book of Dorf and/or Chapter 1 of Malvino. Chapter 5 of Dorf is much more comprehensive, with lots of examples and exercises.

Two-loop problem – Superposition theorem – Current through R2

Thevenin’s circuit application to two loop problem – Calculate current through R2

Norton’s theorem – Current through R2

Electronics in real life ( a small detour! )

Name some applications where you have seen electronic being used

Electrical Engineering Telecommunications ( Telegraph (Morse code), Telephone) Amplifiers Electrical Power Systems

Transducers and Sensors Potentiometer Temperature sensor Switches and their types – ( Multisim model)