Lecture16 - Conduc'vity,
Resistance
and
Resis'vity
...

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Unformatted text preview: Conduc'vity,
Resistance
and
Resis'vity
 L R= σA 1 ρ= σ ρL R= A Resis'vity
 Silver:
1.59×10‐8
Ωm
 Copper:
1.7×10‐8
Ωm
 Gold:
2.44×10‐8
Ωm
 Glass:
1010
~1014Ωm
 Resistance
:
Ω
 Resis'vity
:
Ω
m
 Ohm’s
Law
 J = σE V = IR P = IV ρL Applica'on
of

 R = A L
 How
do
we
understand
behaviors
of
complex
circuits?
 3
Ω
 6
V
 6
Ω
 6
Ω
 6
V
 I1
 I2
 Kirchhoff’s
Law
 1.
Conserva'on
of
Charge
 Kirchhoff’s
Law

 2.
Conserva'on
of
Energy
 ∑ ΔV = 0 ClosedLoop 3
Ω
 6
V
 6
Ω
 6
Ω
 6
V
 I1
 I2
 ...
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This note was uploaded on 07/16/2011 for the course PHY 2049 taught by Professor Saha during the Fall '08 term at University of Central Florida.

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