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Electricity and Electronics for HVAC

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Dec 17, 2008

The McGraw-Hill Companies, Inc. | ISBN: 0-07-149668-8. | English | PDF | Pages:405 | Size: 8.66 MB

Introduction to Electricity

Performance Objectives
¦ Understand how matter and electricity are related.
¦ Understand how liquids, solids, and gases are similar, yet different.
¦ Understand how atoms, electrons, protons, and neutrons are all related to the production of electricity.
¦ Understand how electricity is put to work in the electric circuit.
¦ Understand how switches control the flow of electricity.


Introduction to Electricity

Electricity is as old as the universe. But knowledge about it is relatively new. Early humans were aware of electricity in the form of lightning. They learned of its power when they saw it starts fires and kills people and animals. But it was only about 300 years ago that people began to learn the basic laws of electricity. And only about 120 years have passed since electricity was first put to work. It has been only 100 years since the first practical electric lamp was invented, only 80 years since the vacuum tube was invented, and less than 40 years since the transistor was invented. Despite this brief time, electricity has greatly changed people’s lives—our lives. The universe consists of atoms and every atom contains at least one electron. An electron is the smallest particle of an atom and has a negative electric charge. When the movement of electrons is controlled, they are capable of doing work.

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10 Comments:

Anonymous said...

Thanks for your effort Ko Mgluaye. Really good as a hand book for everyone who's working as an engineer. Thanks so much bro..

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