{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

lec06_ddn - Lecture 6 Current Resistivity as a property of...

Info iconThis preview shows pages 1–15. Sign up to view the full content.

View Full Document Right Arrow Icon
9/11/11 2 Lecture 6 • Current Resistivity as a property of materials • Emf
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
9/11/11 3 Electrostatics versus Electric Current
Background image of page 2
9/11/11 4 Electric Current Notice that flow of positive charge in one direction, + + + + + + + + + + CURRENT I Becomes more positive Becomes more negative It’s completely equivalent to negative charge in the opposite direction. CURRENT I Becomes more positive Becomes more negative - - - - - - - - - -
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
9/11/11 5 Drift Velocity with without
Background image of page 4
9/11/11 6 Drift Speed, Total Charge & Current n = # charge carriers volume q = charge of each particle v d = drift velocity
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
9/11/11 7 Relationship between Current and Drift Speed Find v d for 14-gauge copper wire carrying a current of 1 A. Assume there is 1 free electron/atom. n = n atoms = ρ N M Copper ρ = 8.93 g/cm 3 M = 63.55 g/mol 14 gauge wire Area = 2.081 mm 2 v d = I qnA
Background image of page 6
9/11/11 8 Electric Current one q in one q out
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
9/11/11 9 Resistance Resistance is a property of the object, i.e . It depends on the shape and material
Background image of page 8
9/11/11 10 Resistivity I I length area A L Resistivity is a property of the material.
Background image of page 9

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
9/11/11 12 Temperature Dependence
Background image of page 10
Background image of page 11

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Background image of page 12
Background image of page 13

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Background image of page 14
Background image of page 15
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}