Lecture 1 Summary - V B -V A = 0 V A = V B (loop 1) V B -V...

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Lecture 1 Summary ECE 2100 Alyosha Molnar
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Basic units Charge: q, measured in Coulombs (C) -1C=6x10 20 electrons Energy: W, measured in Joules (J) Voltage: V, measured in Volts (V) V = dW/dq : 1V = 1J/C Current: I, mesured in Amperes (A) I = dq/dt : 1A = 1C/s Power: P, measured in Watts (W) P = dW/dt : 1 W = 1J/s P = dW/dt = dW/dq·dq/dt = V·I
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Basic laws Kirchoff’s current law (KCL) For any node in a circuit, total current into that node sums to zero Example: I 1 +I 2 +I 3 =0 Kirchoff’s voltage law (KVL) For any loop through a circuit, total voltage around that loop sums to zero. V 1 -V 2 -V 3 =0 I 1 I 2 I 3 + V 1 - + V 3 - + V 2 -
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example: An electric car Kirchoff’s current law (KCL) I C -I M = 0 Æ I M = I C (node 2) -I B -I A -I C = 0 Æ I B = -I A -I C (node 1) Kirchoff’s voltage law (KVL)
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Unformatted text preview: V B -V A = 0 V A = V B (loop 1) V B -V C -V M = 0 V M = V B-V C (loop 2) Substituting we find: P B = V B I B = -V B (I A +I C ) Power in battery: negative, Battery supplies power P M = V m I m = (V B -V C )I C Power in motor: positive, motor consumes power AUX Cont. + V B-+ V A-+ V M-+ V C -I B I A I C I M node1 node2 loop1 loop2 Basic componants Voltage source: voltage across terminals is defined Current is a free parameter Connecting V-sources in parallel is not allowed: fails KVL Current source: Current through source is defined voltage across terminals is a free parameter Connecting I-sources in series is not allowed: fails KCL I + V-+ V 1-I 2 + V 3-+ V 2-I 1 I 3...
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This note was uploaded on 03/07/2010 for the course ECE 2100 taught by Professor Kelley/seyler during the Spring '05 term at Cornell University (Engineering School).

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Lecture 1 Summary - V B -V A = 0 V A = V B (loop 1) V B -V...

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