Feb2 - Current and Resistance Chapter 27 All sections...

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

View Full Document Right Arrow Icon
Current and Resistance • Chapter 27 All sections except 3 27.1 Electric Current 27.2 Resistance 27.3 A Model for Electrical Conduction 27.4 Resistance and Temperature 27.5 Superconductors 27.6 Electrical Power 1
Background image of page 1

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

View Full DocumentRight Arrow Icon
Electric Current (27.1) Conductors / metals • In metals, the valence electrons are very weakly attached to their parent atoms. • These electrons can be considered to be “ free ”. • If an electric field is applied, the free electrons will move in the direction of the force applied on them. + Bound electrons Free electrons E F F 2 Charge carrier Electrons Ions holes
Background image of page 2
: The electric current is the rate of flow of charge across a surface. Δt ΔQ I or Units for current: C/s ampère [A] The direction of the electric current is defined as the direction of motion of a positive charge. dt dQ I The direction of the electric current is opposite the direction of electron flows . 3
Background image of page 3

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

View Full DocumentRight Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 12

Feb2 - Current and Resistance Chapter 27 All sections...

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