OHM’s LAW

Chapter 2 OHM’s LAW

Lessons In Electric Circuits Volume I – DC Book
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Summary of Contents

Lessons In Electric Circuits Volume I – DC Book

  • Chapter 2OHM’s LAWContents 45,2.1 45,How 45,voltage, 45,current, 45,and 45,resistance 45,relate . . . . . . . . . . . . . . . . . . 35 50,2.2 50,An 50,analogy 50,for 50,Ohm’s 50,Law . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 52,2.3 52,Power 52,in 52,electric 52,circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 54,2.4 54,Calculating 54,electric 54,power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 56,2.5 56,Resistors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 61,2.6 61,Nonlinear 61,conduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51 67,2.7 67,Circuit 67,wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57 70,2.8 70,Polarity 70,of 70,voltage 70,drops . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60 71,2.9 71,Computer 71,simulation 71,of 71,electric 71,circuits . . . . . . . . . . . . . . . . . . . . 61 86,2.10 86,Contributors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76”One microampere flowing in one ohm causes a one microvolt potential drop.”Georg Simon Ohm2.1How voltage, current, and resistance relateAn electric circuit is formed when a conductive path is created to allow free electrons to contin-uously move. This continuous movement of free electrons through the conductors of a circuitis called a current, and it is often referred to in terms of ”flow,” just like the flow of a liquidthrough a hollow pipe.The force motivating electrons to ”flow” in a circuit is called voltage. Voltage is a specificmeasure of potential energy that is always relative between two points. When we speak of acertain amount of voltage being present in a circuit, we are referring to the measurement ofhow much potentialenergy exists to move electrons from one particular point in that circuit toanother particular point. Without reference to twoparticular points, the term ”voltage” has nomeaning.35