Basic physical concepts of Components

Chapter Basic physical concepts

Teach Yourself Electricity and Electronics Third Edition Book
Pages 748
Views 7,999
Downloads : 12 times
PDF Size : 4.4 MiB

Summary of Contents

Teach Yourself Electricity and Electronics Third Edition Book

  • 1CHAPTERBasic physical conceptsIT IS IMPORTANT TO UNDERSTAND SOME SIMPLE, GENERAL PHYSICS PRINCIPLESin order to have a full grasp of electricity and electronics. It is not necessary to knowhigh-level mathematics.In science, you can talk about qualitative things or about quantitative things, the“what” versus the “how much.” For now, you need only be concerned about the “what.”The “how much” will come later.AtomsAll matter is made up of countless tiny particles whizzing around. These particles areextremely dense; matter is mostly empty space. Matter seems continuous because theparticles are so small, and they move incredibly fast.Even people of ancient times suspected that matter is made of invisible particles.They deduced this from observing things like water, rocks, and metals. These sub-stances are much different from each other. But any given material—copper, for example—is the same wherever it is found. Even without doing any complicated experiments, early physicists felt that substances could only have these consistent behaviors if they were made of unique types, or arrangements, of particles. It took centuries before people knew just how this complicated business works. And even today,there are certain things that scientists don’t really know. For example, is there a smallestpossible material particle?There were some scientists who refused to believe the atomic theory, even aroundthe year of 1900. Today, practically everyone accepts the theory. It explains the behaviorof matter better than any other scheme.Eventually, scientists identified 92 different kinds of fundamental substances in nature, and called them elements. Later, a few more elements were artificially made.3Copyright © 2002, 1997, 1993 by The McGraw-Hill Companies. Click here for terms of use.