Current Electricity
Current Electricity



Electric current is a flow of
electric charge.
Electrons moving in a
conductor such as a copper
wire.
Ions through an electrolyte

Battery or salt solution
CONDUCTORS AND
INSULATORS




Conductors allow electrons to flow
through them easily.
Copper atom has one valence
electron.
Valence electrons of conductors
can gain enough energy to break
away and become free electrons.
Free electrons can move from one
atom to another. http://www.ndt-
ed.org/EducationResources/HighSchool/Electricity/v
alenceshell.htm
Cu
CONDUCTORS AND
INSULATORS




Insulators do not allow
electrons to flow through them
easily.
They are materials that do not
have any free electrons.
They do not make good
conductors of electrical
currents.
Ex wood, plastic, rubber, noble
gases

Insulators
can protect
us from
electric shock
Electric Circuit:

If the (+ve) & (-ve) sides of the battery are connected
by a conductor, electrical current will flow as the
electrons move from the (-ve) side to the (+ve )side.
(+)
(-)
Components of a Simple
Circuit:
1.
Source of electrical energy:
•
2.
Electrical load:
•
3.
Anything that converts
electrical energy to another
form of energy (ie: toaster
converts electrical energy to
heat)
Circuit control device:
•
4.
(ie: a battery)
(ie: a switch, a timer)
Connectors:
•
wires that connect the
components of a circuit together

Schematic Diagram
of a simple circuit:
CURRENT ELECTRICITY:
http://www.youtube.com/watch?v=5laTkjINH
rg
(10 min)
(intro current, coulomb)
Introducing Current Electricity:
 Read page 507-509 Answer # 2-6 page 510
 Electric Current:
 Read page 556-557 Answer # 1-3 page 557
 Potential Difference:
 Read page 560-561 Answer # 2-4 page 561

Review of Static Electricity for Quiz
Page 498 # 1, 4, 7, 16
Page 499 # 23
Page 500 -501 Self Quiz # 1-12, 14, 15a, 18