BASIC LAWS
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Dr. T.V Chabata
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➢Ohm’s Law
➢Kirchoff’s Law
➢Circuit Analyses techniques:
➢combining resistors in series or parallel,
➢voltage division,
➢current division,
➢delta-to-wye
➢wye-to-delta transformations
INTRODUCTION
 Ohm’s law and Kirchhoff’s laws, form the
Dr tvChabata: Circuit theory
foundation upon which electric circuit analysis
is built.
 They enable the determination of circuit
variables: current, voltage, power and energy.
 Discussion of techniques commonly applied in
circuit design and analysis.
 combining resistors in series or parallel,
 voltage division
 current division
 delta-to-wye transformations
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 wye-to-delta transformations.
RESISTANCE
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RESISTANCE: BASIC CONCEPTS AND
ASSUMPTIONS
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OHM’S LAW: FOR A PORTION OF A CIRCUIT
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RESISTORS & PASSIVE SIGN CONVENTION
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OTHER EQ. DERIVED FROM OHM’S LAW
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EXAMPLE: OHM’S LAW
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SHORT CIRCUIT AS ZERO RESISTANCE
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SHORT CIRCUIT AS VOLTAGE SOURCE (0V)
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OPEN CIRCUIT
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OPEN CIRCUIT AS CURRENT SOURCE (0 A)
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CONDUCTANCE
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CIRCUIT BUILDING BLOCKS
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BRANCHES
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NODES
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LOOPS
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OVERVIEW OF KIRCHHOFF’S LAWS
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KIRCHHOFF’S CURRENT LAW
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KIRCHHOFF’S CURRENT LAW FOR BOUNDARIES
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KCL - EXAMPLE
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IDEAL CURRENT SOURCES: SERIES
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KIRCHHOFF’S VOLTAGE LAW - KVL
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KVL - EXAMPLE
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EXAMPLE – APPLYING THE BASIC LAWS
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EXAMPLE – APPLYING THE BASIC LAWS
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EXAMPLE – APPLYING THE BASIC LAWS
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RESISTORS IN SERIES
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RESISTORS IN PARALLEL
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RESISTORS IN PARALLEL
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VOLTAGE DIVIDER
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CURRENT DIVIDER
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RESISTOR NETWORK
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RESISTOR NETWORK - COMMENTS
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DELTA AND WYE CONFIGURATIONS
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