{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

12 - Current and Resistance

12 - Current and Resistance - PHYSICS 212 Fall 2009 Current...

This preview shows pages 1–6. Sign up to view the full content.

PHYSICS 212 Fall 2009 Current and Resistance 9/21/2009

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

View Full Document
Moving Charges Switch from electrostatics to charges in motion Moving Charges Cause Currents household wiring lightening solar wind beam of electrons “nerve-currents” in our body Different Types of Materials conductors - metallic and ionic semiconductors superconductors plasmas Focus on steady currents in conductors
Current Amount of charge that flows past a point (per unit time) Units: 1(A)mpere = 1(C)oulomb/(s)econd [A=C/s] Direction of Current Flow Although charge carriers are negatively charged electrons, the direction of the current is in the direction that positive charge carriers would flow. scalar quantity i = Δ q Δ t

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

View Full Document
Moving Charges Which one of the following statements concerning the electric field inside a conductor is true if electrons are moving from right to left in a conducting wire? a) The electric field must be zero in this case. b) The electric field is directed perpendicular to the direction the electrons are moving. c) The electric field is directed toward the left. d) The electric field is directed toward the right.
Current Flow Kirchoff’s Rule - Junctions - current splits at a junction but is conserved.

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

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

Page1 / 15

12 - Current and Resistance - PHYSICS 212 Fall 2009 Current...

This preview shows document pages 1 - 6. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online