Lecture 1+2 Summary_v2

# Lecture 1+2 Summary_v2 - Lectures 1+2 Summary Basic units,...

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Spring 2011 ECE 2100 A. Molnar, Cornell University 1 Lectures 1+2 Summary Basic units, KCL, KVL, Ohms law, IV curves ECE 2100 Alyosha Molnar

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Spring 2011 ECE 2100 A. Molnar, Cornell University 2 Basic units Charge: q, measured in Coulombs (C) -1C=6x10 18 electrons Energy: W, measured in Joules (J) Voltage: V, measured in Volts (V) V = dW/dq : 1V = 1J/C Current: I, measured 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
Spring 2011 ECE 2100 A. Molnar, Cornell University 3 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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Spring 2011 ECE 2100 A. Molnar, Cornell University 4 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)
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## This note was uploaded on 06/10/2011 for the course ECE 2100 taught by Professor Kelley/seyler during the Spring '05 term at Cornell.

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Lecture 1+2 Summary_v2 - Lectures 1+2 Summary Basic units,...

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