CKT02 Voltage Current and Resistancefivedots.coe.psu.ac.th/~montri/Teaching/241-205/CKT02.pdf ·...
Transcript of CKT02 Voltage Current and Resistancefivedots.coe.psu.ac.th/~montri/Teaching/241-205/CKT02.pdf ·...
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Electric Circuit 1
241241--205205Computer Engineering Circuits Computer Engineering Circuits Voltage Current and ResistanceVoltage Current and Resistance
DK22
Electric Circuit 2
Chapter 2Chapter 2Voltage Current and ResistanceVoltage Current and Resistance
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Electric Circuit 3
OUTLINE
Electric Circuit 4
Atomic Structure
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Electric Circuit 5
Atomic Structure
Electric Circuit 6
Atomic Structure
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Electric Circuit 7
Atomic Structure
Electric Circuit 8
Atomic Structure
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Electric Circuit 9
Atomic Structure
•> 29 Electrons•> Orbit the nucleus in four shells•> 1 valence electron
The valence Electrons of copper are not bound to the given atom but free to move. Free electrons make copper an excellent conductor .
Electric Circuit 10
Categories of Materials
ConductorsOne to three valence electrons : Silver, Copper …
SemiconductorsFour valence electrons : Silicon and germanium.
InsulatorsMore than four valence electrons.
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Electric Circuit 11
Electrical ChargeElectrical charge (Q) : an electrical property of matter that exists because of an excess or deficiency of electrons.
Electric Circuit 12
Electrical Charge
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Electric Circuit 13
Electrical Charge
Electric Circuit 14
Electrical Charge
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Electric Circuit 15
Positive and Negative Charge
Electric Circuit 16
Voltage, Current and ResistanceVoltage
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Electric Circuit 17
Current
Electric Circuit 18
Current
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Electric Circuit 19
Current
Electric Circuit 20
Resistance
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Electric Circuit 21
Conductance
Electric Circuit 22
Voltage And Current SourceVoltage SourceIdeal Voltage Source
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Electric Circuit 23
Voltage Source
Electric Circuit 24
Voltage Source
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Electric Circuit 25
Voltage SourceElectronics Power Supply
Electric Circuit 26
Current SourceIdeal Current Source
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Electric Circuit 27
ResistorFixed Resistors
Electric Circuit 28
ResistorCutaway view of Resistors
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Electric Circuit 29
ResistorResistor Color Code
A B C D
Value of Resistor = AB x 10C ±D% Ohm
Electric Circuit 30
ResistorResistor Color Code
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Electric Circuit 31
Resistor Color Code
Electric Circuit 32
ResistorFive-band Color CodeFor precision resistors with tolerances of 1%, 2% or less
A B C D E
Value of Resistor = ABC x 10D ±E% Ohm
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Electric Circuit 33
Five-band Color Code
Electric Circuit 34
Resistor Label Code
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Electric Circuit 35
Variable Resistor
Electric Circuit 36
Variable Resistor
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Electric Circuit 37
Variable Resistor
Electric Circuit 38
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Electric Circuit 39
The Electric CircuitBasic Circuit
Electric Circuit 40
Basic Circuit
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Electric Circuit 41
Circuit Current Control
Electric Circuit 42
Circuit Current Control
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Electric Circuit 43
Circuit Current Control
Electric Circuit 44
Switch Type
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Electric Circuit 45
Several Varieties of Mechanical Switches
Electric Circuit 46
Semiconductor Switches
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Electric Circuit 47
Protective Devices
Electric Circuit 48
Wires
•• AWGAWG : American Wire Gauge• Cross-sectional area : Circular mil (CM) , one circular mil is the area
of a wire with a diameter of 0.001 inch or 1/1000 Inch (1 mil)
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Electric Circuit 49
Wires
Electric Circuit 50
Wires Resistance
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Electric Circuit 51
Wires Resistance
Electric Circuit 52
Ground
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Electric Circuit 53
Example of using grounds in a circuit application
Electric Circuit 54
Ground
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Electric Circuit 55
Basic Circuit measurements
Electric Circuit 56
Measuring Current
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Electric Circuit 57
Measuring Voltage
Electric Circuit 58
Measuring Resistance
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Electric Circuit 59
Summary
Electric Circuit 60