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# lec4 - ENGR 111 Lecture 4 Reading Chapters 19 Class notes...

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ENGR 111 Lecture 4 Reading: Chapters 19, Class notes

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Lecture 4: DC Fundamentals z Review of Last Class: z More/less electrons => Charge z Potential charge difference results in charge flow or current z Potential charge difference = voltage z Different materials offer different resistance to current z Voltage V(volts), Current I (Amperes), Resistance R (ohms)
Water Analogy z Charge flow through a wire similar to water flow in a pipe z Harder to push water through a thinner pipe (smaller current, higher resistance) z 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) z Kirchoff’s Current Law (KCL): { Current flowing into and out of a node should be equal { Conservation principle
Kirchoff’s voltage Law z 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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z Ohm’s law relates resistance, voltage and current V = I * R z
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lec4 - ENGR 111 Lecture 4 Reading Chapters 19 Class notes...

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