Teori Kelistrikan
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Transcript of Teori Kelistrikan
![Page 1: Teori Kelistrikan](https://reader035.fdocuments.us/reader035/viewer/2022062412/577cceac1a28ab9e788e26bb/html5/thumbnails/1.jpg)
Teori ElektrisitasVIR PIV dan Kapasitor!!!
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Energi When an object is at
some height in a gravitational field it is said to have gravitational energi potensial, PEg
PEg
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Energi Like gravitational fields causing masses to
have energi potensial, Electric Fields cause charges to have electric energi potensial, PEE
PEE is a type of mechanical energi MEtotal = KE + PEg + PEs + PEE
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Energi To give something PE you must do work
(apply force over a distance) on the something (raising up in g-field)
For PEE to occur a FE must be applied by either
a. An E-Field (uniform)b. A pair of charges
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EnergiUniform E-field
AB
Line Color
Red: E-Field
Black: Equipotential lines
Blue: charge displacement
E
W PE FdF EqPE qEd
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Energi Pair of Charges
1 22
1 2
c
E c
W PE Fdq qF kr
q qPE kr
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Electric Potential
Any point in an electric field is said to have Electric Potential, V. However, only a Difference in PE is measurable (remember zero point) so we talk of electric potential difference AKA potential difference, ΔV.
EPEVq
PEVq
unit Volt, VJ1V=1C
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Potential Difference
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Potential Difference
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Potential Difference Back to the zero point
A convenient zero point to chose in a circuit or any electric system is the “ground”
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Battery (cells) A battery produces
electricity by transforming chemical energi into electrical energi
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BatteryCarbon Electrode
Zinc Electrode
Sulfuric Acid
+
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Capacitor A capacitor is a storehouse of charge dan energi that
can be reclaimed when needed for a specific application
A capacitor will only charge to the potential difference between the terminals of the battery
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Capacitance Capacitance, C: The ability of a conductor to
store energi in the form of electrically separated charges
Capacitance is the ratio of charge to potential difference
QCV
unit Farad, FC1F=1V
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Capacitance Capacitance depends on size dan shape
0ACd
2
-120 2permittivity of free space, 8.85x10
Area of one plated distance between plates
CNm
A
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Capacitor Energi stored in a
capacitor
21 12 2
U energy QV CV
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Electric Current Movement of electric charge Rate of charge movement
QIt
unit Ampere, AC1A=1s
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Charge Movement
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Charge Movement
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Circuit Analogy
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Types of Current AC Alternating current charges
continuously change direction forward dan back at 60 Hz
Example: outlets (approx 120 V) DC Direct current charges move in one
direction Example: batteries
AC-DC Debate births the Electric Chair
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Resistance Resistance is the impedance of the motion of
charge through a conductor The ratio of potential difference across a
conductor to the current it carries
VRI
2
unit ohm, V Js1 1 1A C
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Ohm’s Law
V IR
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Resistance Depends on: Length, cross sectional area,
material, dan temperature
LRA
2
resistivity, mL length, m
A cross sectional area, m
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Resistance dan Temp
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Resistance dan Thickness
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Resistor An electronic element
that provides a specified resistance.
A current or voltage REGULATOR
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Power (it’s Electric!) Power: Rate at which work is done. OR Rate
at which energi is transformed Electric Power: The rate at which charge
carriers convert PEE into non-mechanical energi
P IVunit watt, W
J1 W = 1 s
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Reading dan Homework Read Chapter 17
pp 593 - 625
HW due on test day:p 599 1-3; p 601 2, 3, 5-9;p 607 1 – 4 (B); p609 1 – 5p 615 1 – 6; p 616 2-4, 7,9p 621 1 – 5
Extra Practicep 626 – 628 11, 20 – 54