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  "

(+) POSITIVE  – contains fewer electrons

compared to its protons 

 NEUTRAL – contains an ____l number of

electrons and protons

- zero net charge 

(-) NEGATIVE  – contains ____ electrons

compared to its protons 

Electriccharge

Law ofElectrostatics

Law ofquantization

of charge

Symbol: q

Unit: Coulomb,[C]

Law ofConservation

of charge

enqq   =

C  xqe

19106.1  !

=

F 12 q1 

F 21 q2 

r 

+ +

• F q1 

• F q2 

2

1

r  F ! 

2

21

r 

qq F ! 

2

21

r 

qqk  F   =

radial electric field lines

 Isolated

 positive charge

 Isolated

 Negative charge

Electric Phenomena

charge

Force

Fe = k q1q2

r 2

Electric Field (E)(different view)

charge

Field

charge

http://image.slidesharecdn.com/magnetsandelectromagnetsconceptmap

Magnetic Phenomena

poles

Force

Fm = k’ p1p2

r 2

Magnetic Field (B)(different view) 

magnet pole

Field

magnet pole

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http://www.bbc.co.uk/scotland/learning/bitesize/higher/physics/elect/energy_volts_rev1.shtml

+

-

The motion of electric charges in an

uniform electric field 

+

+

-

-

 _____________

conventional

current

electron flow

[ ]sC

t

qI   ==

  =   Ampere[ ] =   A[ ]

Greater

electric

 potential

lower

electric

 potential

Voltage

V

http://scifiles.larc.nasa.gov/text/ 

kids/Problem_Board/problems/ 

electricity/circuits2.html

http://knol.google.com/k/electronic-circuits-

design-for-beginners-chapter-1

 Schematic diagram

Voltage source

conductor

resistor

or load

switch

http://www.lcra.org/energy/education_safety/getpower.html

through relative motion

between magnet & coil;

through changing current

in a coil.

 How can a magnet

 produce electricity?

A

changing

 magnetic field

produces electricity

 Michael Faraday(1791 - 1867)

http://www.worsleyschool.net/science/files/transformers/page.html  s

 p

 p

 s

 p

 s

 I 

 I 

 N 

 N 

V 

V ==

http://www.worsleyschool.net/science/files/transformers/page.html  s

 p

 p

 s

 p

 s

 I 

 I 

 N 

 N 

V 

V ==