Lecture 4

# Lecture 4 - ENGR 111 Lecture 4 Reading: Chapters 19, Class...

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ENGR 111 Lecture 4 Reading: Chapters 19, Class notes

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Lecture 4: DC Fundamentals l Review of Last Class: l More/less electrons => Charge l Potential charge difference results in charge flow or current l Potential charge difference = voltage l Different materials offer different resistance to current l Voltage V(volts), Current I (Amperes), Resistance R (ohms)
Water Analogy l Charge flow through a wire similar to water flow in a pipe l Harder to push water through a thinner pipe (smaller current, higher resistance) l For water to flow, there has to be pressure difference at ends of pipe ¡ Voltage has to exist across a wire for current

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Some basic laws (Kirchoff) l Kirchoff’s Current Law (KCL): ¡ Current flowing into and out of a node should be equal ¡ Conservation principle
Kirchoff’s voltage Law l Voltages around a closed circuit should sum to zero ¡ When you come to the same point, voltage difference should be zero Start End V1 V2 V3 V4 V5 V1 + V2 + V3 +V4 + V5 = 0

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l Ohm’s law relates resistance, voltage and
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## This note was uploaded on 03/31/2008 for the course ENGR 111 taught by Professor Walker during the Spring '07 term at Texas A&M.

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Lecture 4 - ENGR 111 Lecture 4 Reading: Chapters 19, Class...

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