2-07-08Lec10 - Lecture 10 Lecture 10-1 Capacitor Examples...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon

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

View Full DocumentRight Arrow Icon

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

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Lecture 10 Lecture 10-1 Capacitor Examples 10 2 1 2 1 2 /2 /2 2 A A C C C d d A d = + = + + = 2 C C C C /2 C C C C C ? C ?=2/3 1 2 1 1 1 /4 3 /4 1 31 4 4 d d C C C A A d A = + = + = + Lecture 10 Lecture 10-2 Electric Current Current = charges in motion q I t Magnitude Units: [I] = C/s = A (ampere) Current is ascalar, signed quantity, whose sign corresponds to the direction ofmotion of net positive charges by convention J = current density (vector) in A/m A I JdA = caca i rate at which net positive charges move across a cross sectional surface lim t dq dt = Lecture 10 Lecture 10-3 Microscopic View of Electric Current in Conductor All charges move with some velocity v e random motion with high speeds (O(10 6 )m/s) but with a drift in a certain direction on average if E is present Drift velocity v d is orders of magnitudes less than the actual velocity of charges. A Why random motion? thermal energy scattering off each other, defects, ions, Lecture 10...
View Full Document

This note was uploaded on 04/07/2008 for the course PHYS 241 taught by Professor Wei during the Spring '08 term at Purdue University-West Lafayette.

Page1 / 14

2-07-08Lec10 - Lecture 10 Lecture 10-1 Capacitor Examples...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online