TAILIEUCHUNG - Lecture A+ Certification (3/e): Chapter 22 - James Karney

Chapter 22, "The basics of electrical energy," covers electricity and how it relates to the computer. A computer technician does not need to be an electrical engineer, but does need to be able to perform basic tests and to work safely. This chapter provides the reader with background in these issues. | Chapter Overview Electrical power Electrostatic discharge Safety and electrical power Understanding Electricity and Electrical Energy Electricity refers to The form of energy associated with moving electrons and protons The energy made available by the flow of electric charge through a conductor Terminology Terminology (Cont.) Ohm’s Law Ohm’s law states that voltage equals the product of the current times the resistance. Resistance: R=V/I Current: I=V/R Volts: V=IR In these formulas, R = resistance in ohms, V = voltage, and I = current in amperes. Personal Computers and Electrical Power Alternating Current (AC) AC power is man-made, by use of generators. A wire coil inside a generator rotates and produces current that flows from one pole of a magnet to the other, or alternates the direction of the flow. The number of revolutions made by the generator is called its frequency. In the United States, power companies run their systems at 60 turns per second to .

• Tin học văn phòng
• A+ Certification
• Lecture A+ Certification
• A+ exams
• Computer hardware
• Computer software
• Electrical energy
• Electrical power
• certification documents
• document certification
• certification exam in English
• said certification exam
• know certification
• certification exam preparation materials
• Rules for Certification of Cargo Containers
• Certification of Cargo Containers
• Conditions of Certification
• Design Review
• Tank Containers
• Bureau Veritas Certification Newsletter Số 03
• Bureau Veritas Certification Newsletter
• Tiêu chuẩn hiện hành
• Tiêu chuẩn mới
• Bureau veritas certification Việt Nam
• ISO 103772013
• Quy định mới trong nước
• Linux Professional Institute Certification
• LPIC 1 Certification Bible
• system administrators
• computer tips
• linux operating system
• Troy Technologies USA
• A+ CERTIFICATION STUDY GUIDE
• công nghệ thông tin
• chứng chỉ quốc tế
• cisco certification
• Microsoft certification MCDBA
• Microsoft MCDBA certification
• multilayer switch
• computer network
• microsoft office
• cisco network administrators
• Windows networking certification
• network management
• network management curricula
• textbooks
• network administrator
• network administrator documentation
• specialized management
• linux network certification
• network certification windows
• Diploma
• cisco network administrator
• network administrator ccna
• network management curriculum
• curriculum administrators
• network administrators document
• Faculty of management
• Headway book
• secrets certification exam
• certification exam materials
• study for tests taken in English
• English proficiency test
• certification exam preparation
• English
• Bank exam
• exam English
• English undergraduateeducation
• english test
• review English
• Upgrading a computer
• Computer disassembly
• Troubleshooting techniques
• Client relations
• Critical care nursing certification
• Certification examination
• Cardiovascular disorders
• Pulmonary disorders
• Endocrine disorders
• Immunologic disorders
• Neurologic disorders
• Ebook Complete java 2 certification
• Complete java 2 certification
• Language fundamentals
• Operators and assignments
• Converting and casting
• Exception handling
• Đề thi tiếng Anh trình độ C
• Tiếng Anh trình độ C
• Certification exam
• Preparation materials
• Certificates C
• C Exam in English
• Zend PHP
• Certification StudyGuide
• The Basics of PHP
• Object Oriented PHP
• PHP and the Web
• Regular Expressions
• programming language
• Triển khai Certification Authority
• Lab windows server 2008
• dịch vụ cấp phát certificate
• quản lý mạng nội bộ
• tài liệu học quản trị mạng
• certification exam tips
• exam certificates say
• English language proficiency test
• english exam certificates
• exam taken in English
• C Exam
• Cisco Press
• Switching Exam Certification Guide
• CCNP
• Microsoft
• Value of Certification
• the dots
• Database
• Windows
• DOS
• information technology
• international certification
• Troubleshooting
• cisco CCNA
• Network security
• management network