Chapter1(2) - Chapter 1 Circuit Terminology 1 Overview...

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Chapter 1 Circuit Terminology 1
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Overview 2 Systems of Units. Electric Charge. Current. Voltage. Power and Energy. Circuit Elements.
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System of Units (1) Quantity Basic unit Symbol Length meter m Mass kilogram kg Time second s Electric current ampere A Thermodynamic temperature kelvin K Luminous intensity candela cd 3 Six basic units
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System of Units (2) 4 The derived units commonly used in electric circuit theory   Decimal multiples and  submultiples of SI units  
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Atomic Theory An atom consists of a nucleus of protons and neutrons surrounded by a group of orbiting electrons . Electrons are negative, protons are positive. In its normal state, each atom has an equal number of electrons and protons. Electrons orbit the nucleus in discrete orbits called shells . These shells are designated by letters K, L, M, N, etc. Only certain numbers of electrons can exist within any given shell. 5
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Atomic Theory The outermost shell of an atom is called the valence shell . The electrons in this shell are called valence electrons . No element can have more than eight valence electrons. The number of valence electrons affects its electrical properties 6
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Coulomb’s Law The force between two charges Q 1 and Q 2 is
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