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Reference Guide

# Permachart - Marketing Reference Guide: Magnetic Circuit, Electrical Network, Angular Velocity

4 pages2312 viewsFall 2015

Department
Electrical Engineering
Course Code
4400:307
Professor
All
Chapter
Permachart

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w w w . p e r m a c h a r t s . c o m
GLOSSARY O F TERMS MECHANICS FUNDAMENTALS
NEWTONS LAWS OF MOTION
Conductor Material which permits electrons to flow freely
Couple Two equal and opposite parallel forces that
are applied to the same body
Dielectric Insulating material between capacitor plates;
capacitance increases by numerical factor, k
(dielectric constant)
Electric Measure of the opposition that an electric
Impedance circuit presents to the flow of current when
voltage is applied
Electromagnetic Oscillations of the inductor’s magnetic
Oscillation field and the capacitor’s electric field
EMF Device Works on charges to maintain a potential
difference between output terminals
Equipotential Adjacent points on a surface with the same
Surface electric potential; electric field is always
perpendicular to equipotential surfaces
Ferromagnetic Substance in which magnetization persists
Material after the field has been removed
Force Vector action of one body on another
Hysteresis Residual magnetism that is left when the
material (such as iron) is slowly demagnetized
Inertia An attribute of bodies implying capacity to
resist changes of motion
Insulator Material that impedes conductance of
electricity
Integrated Complete circuit is contained in a single piece
Circuit of semiconductor material
Magnetic Simplest magnetic structure (such as a bar
Dipole magnet) where net magnetic flux is zero
Mesh In circuit analysis, a loop that has no loop in
its interior
Momentum An attribute that is proportional to the mass
and velocity of a body
Open Circuit Path for current flow between 2 points is
broken
Phasor A vector that rotates around an origin
Principle In a circuit network, a node (junction) with
Node three or more branches
Reactance Circuit property with capacitance and
inductance
Rectification Changing AC to DC by blocking the reverse
flow of a charge
Resonance An oscillation of a system at its natural
frequency
Semiconductor Material that is not conductive nor insulating
Shearing Force In mechanics, a force acting parallel to a
plane
Short Circuit Path for current flow between two points has
zero impedance
Stress In mechanics, the measure of internal forces
of a body between particles resisting
separation
Superconductor Material that presents no resistance to the
movement of electric charge
Torque Turning force or twisting moment
Torsion Torque applied in planes perpendicular to
body’s axis
Transformer Electromagnetic device with 2 or more
mutually coupled windings; it can raise and
lower voltage in a circuit
Law I Bodies will continue in uniform motion unless acted
upon by external forces
Law II The rate of change of a body’s linear momentum is
proportional to, and in the direction of, force applied
F = ma
Law III Forces of action and reaction between bodies are equal
in magnitude, opposite in direction, and collinear
CONDITIONS OF EQUILIBRIUM
• Static equilibrium occurs when the resultants of all external forces
acting on a body are zero
Equilibrium Equations
GEOMETRY OF MOTION
• In mechanics, kinematics is the study of the motions of bodies as
a function of time
MOMENTS OF INERTIA
• Define the relationship between the area or mass of a body and
the position of a line
• Moment of inertia of a figure = sum of moments of its parts
Linear All points of a body follow congruent paths
Rotational Paths circle about an axis; velocity and acceleration
Harmonic Body moves back and forth about a position at rest
Oscillation (amplitude represents maximum deflection)
Base Derivatives of Kinematics
Velocity Where srepresents distance and
trepresents time
Angular Where frepresents the angle
Velocity
Angular Where wrepresents angular velocity
Acceleration
Area Moments of Inertial, I (Statics)
Measuring
the distribution
Mass Moments of Inertia, I (Dynamics)
Measuring the moment of inertia
of a volume:
vds
dt
=
ω
=d
dt
φ
dt
=
ω
IydA
x=2
IxdA
y=2
IrdA
z=2
y
0
A
x
ry
dA
x
IrDmrdm=∑=
22
dm
r
Note: Equations are for planar, 2-dimensional, and 3-dimensional
rigid body statics
• Vector relationships for a force system: F= 0 and M= 0
• Written as components along x-, y-, and z-axes, relationships
become Fx= 0, Fy= 0, Fz= 0, Mx= 0, My= 0, and
Mz= 0
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