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ECE201_Lecture08

# ECE201_Lecture08 - E E201 Linear Cir cuit Analysis I L...

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1 EE201 Linear Circuit Analysis I Lecture 8. Topics: Mesh (Loop) Analysis 1. Loop (Mesh) Analysis – Basics (1) The concepts of loops, loop currents & branch currents Loops Loop currents: I 1 , I 2 (may NOT be the actual current flowing in a branch). Branch current I L = I 1 – I 2 (this is the ACTUAL current flowing in a branch). Ohm’s Law applies to branch current, V L = I L · R. Ohm’s Law may or may not apply to loop currents. (2) How to write loop equations: The goal of loop analysis is to find all the branch currents. 3 Steps: Step 1- Use KVL to sum the voltages around a loop; Step 2 - Use Ohm’s law to express voltages in terms of loop currents; Step 3 - Use loop currents to compute branch currents. Example . Loop 1: + - + V L I 2 I 1 I L R L

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2 Loop 2: What is V L ? (3) What if we change the direction of I 2 (because of the current source)?