Class notes
Class notes physics 1155 (PHYS1155)
- Course
- Physics 1155 (PHYS1155)
- Institution
- Northeastern University
Electric Current notes
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Current conductor internalfieldwithout
Acurrentisany ofchargefrom
motion one toanother
region
it on
theiaar.sunignaeetwa
riacement
anelectricfieldinaconductorcauseschargestoflow
orwith
aninternalfield
the a 5andisthe
basicunitoelectromagnetism
f another units
iniise
electromagnetic
traiemggreentisampere
are
Direction of Current Flow
Acurrentcanbe bypositiveornegativechargenow
produced
Conventionalcurrent
istreatedasaflowofpositivecharges
Themovingchargesinmetalsareelectrons
ConventionalCurrent
eean
M
Current, drift velocity, and current density
inecharge
that thesurfaceninanintervalat is a qnavadt
crosses
area a
visthe of charges
velocity the
drift
is
in iie
Thecurrentdensityisdefinedas
nav
Concentration of Charges
in
from
there
metals
the and
d ensity
isaboutone
a tomic
free
of
weight thematerial theconcentration ofcharges
e lectron atomso
per canbeestimated
If iosmen cnn.mx10
aug
n akm.is s.sxio.ms
in
conductionelectronDensity metals
etal ElectronD ensity ms
iiii
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