Electric Current

n      stream of electrically charged particles passing through a given area

      (Movement of electrons in a wire)

 

A)  Conductivity of Solids

1)    Metals - contain many __________ electrons (good conductors)

 

2)    Glass, fused quartz, rubber - good _________________

n      Few free electrons

          Insulators have a High _______________  - (Structural resistance to electrons flow)

3)    Semiconductor - a material with a resistance _________________

 

_________________________________________________________

 

B)    Conductivity of _____________

1)    pure liquids ______________________

2)    liquid with dissolved ________________ conduct

 

 ( ___________________________________ solution)

    ( ion movement transfers charge not electrons)

C)  Conductivity of ______________

n      Gases conduct when _______________________ exposed to:

a)   high energy ________________

b)   OR ________________________

c)    OR with collision with high speed particles

·         Charge in a gas is transferred by ________________________________________________/

 

plasma – very hot ionized gas

 

D)   Conditions for passing current

1)    _______________________ circuit

2)    ______________________________ (voltage) supplied by some source

 

                                                          ex. ______________________

 

3)    _______________