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Chapter 1Basic Electric Circuit Concepts
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BASIC CONCEPTS
LEARNING GOALS
System of Units: The SI standard systemSysteme International unit (=International System of Units)()
Basic Quantities: Charge, current, voltage, power and energy
Circuit Elements: Active and Passive
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http://physics.nist.gov/cuu/index.html
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Information at the foundation ofmodern science and technologyfrom the Physics Laboratory of NIST
Detailed contents
Values of the constants and related informationSearchable bibliography on the constants
In-depth information on the SI, the modernmetric system
Guidelines for the expressionof uncertainty in measurement
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SI DERIVED BASIC ELECTRICAL UNITS
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CURRENT AND VOLTAGE RANGES
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Strictly speaking current is a basic quantity and charge is derived. However,physically the electric current is created by a movement of charged particles.
+
++
)(tq
+
What is the meaning of a negative value for q(t)?
PROBLEM SOLVING TIPPROBLEM SOLVING TIPIF THE CHARGE IS GIVEN DETERMINE THE CURRENT BYDIFFERENTIATIONIF THE CURRENT IS KNOWN DETERMINE THE CHARGE BYINTEGRATION
A PHYSICAL ANALOGY THAT HELPS VISUALIZE ELECTRICCURRENTS IS THAT OF WATER FLOW. CHARGES ARE VISUALIZED AS WATER PARTICLES
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+
++
)(tq
+
EXAMPLE
])[120sin(104)( 3 Cttq =
=)(ti )120cos(120104 3 t ][A
][)120cos(480.0)( mAtti =
EXAMPLE
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