Lecture _2

# Lecture _2 - ECE ECE 2004 Electric Circuits Lecture #2...

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ECE 2004 ECE 2004 – Electric Circuits Electric Circuits Lecture #2 – Problem Solving & Ohm’s Law Instructor – Dr. R. M. Buehrer Spring 2010

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troduction Introduction y Lecture Objectives Define the physical property of resistance Describe Ohm’s Law y Reading 7- 8; 21- 2 1.7 1.8; 2.1 2.2 y Homework Problems – HW #1 Due hursday Thursday R.M. Buehrer - Spring 2010 2
esistance Resistance y In general, materials resist electric current. This property is termed resistance defined as l ρ = resistivity of the material R A ρ = l = length A = cross-section area R y We model the resistance of a material using an element known as a resistor R.M. Buehrer - Spring 2010 3

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hm’s Law Ohms Law y Ohm determined that the voltage ( v ) across a resistor is proportional to the current ( i ) y This proportion is defined as Resistance R vi R = v R = R.M. Buehrer - Spring 2010 4 Georg Ohm 1787-1854 i
nits of Resistance Units of Resistance y The unit of resistance is the Ohm (in honor of Georg) 11 V Ω= A R.M. Buehrer - Spring 2010 5

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irection of Current Direction of Current Ohm’s law assumed current flows from higher

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## This note was uploaded on 01/26/2010 for the course ECE 2004 taught by Professor Kwa-surtam during the Spring '08 term at Virginia Tech.

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Lecture _2 - ECE ECE 2004 Electric Circuits Lecture #2...

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