ELECTRICITY PPT
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Transcript of ELECTRICITY PPT
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ELECTRICITY PPTCOMPILED & EDITED BY
MUKESH KUMAR CHHIPA
TGT WE K V 2 AJMER (RAJ.)
9269048633(M)
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Electricity TheoryVIR PIV and Capacitors!!!
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Energy When an object is at
some height in a gravitational field it is said to have gravitational potential energy, PEg
PEg
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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 energy into electrical energy
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BatteryCarbon Electrode
Zinc Electrode
Sulfuric Acid
+
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Capacitor A capacitor is a storehouse of charge and energy 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 energy in the form of electrically separated charges
Capacitance is the ratio of charge to potential difference
QC
V
unit Farad, F
C1F=1
V
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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 and 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
VR
I
2
unit ohm,
V Js1 1 1
A C
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Ohm’s Law
V IR
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Resistance Depends on: Length, cross sectional area,
material, and temperature
LR
A
2
resistivity, m
L length, m
A cross sectional area, m
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Resistance and Temp
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Resistance and 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 energy is transformed Electric Power: The rate at which charge
carriers convert PEE into non-mechanical energy
P IVunit watt, W
J1 W = 1
s
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Reading and 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 – 5
p 615 1 – 6; p 616 2-4, 7,9
p 621 1 – 5
Extra Practicep 626 – 628 11, 20 – 54