Transcript Electric Current Part I

Today’s Agenda…11/17
• Bellringer: Worksheet
• Review Note-taking Worksheet &
Discuss
• Notes on Electric Current Part I
Electric Current
Part I
Study Pack #10
Review
• A material through which electrons can
move easily is a _____.
• A. conductor
• B. insulator
• C. nucleus
• D. electromagnetic
Review
• Each of the following is an example of
an insulator except _____.
• A. wood
• B. copper
• C. glass
• D. rubber
Review
• An atom has equal numbers of protons
and _____.
• Neutrons
• Electrons
• Ohms
• Volts
Review
• Every proton and electron is surrounded
by a(n) _____.
• A. electric circuit
• B. electric field
• C. insulator
• D. magnetic pole
Today’s Goals…
• I can describe how an electric
current flows.
• I can explain how electrical energy
is transferred in a circuit.
• Study Pack #10
• Page 201
What do you know?
• True or False
– In a wire there is an electric current
when protons in the wire move along
the wire.
– The unit for electric current is the
ampere.
– Electric currents will flow when a
switch is open.
– Batteries can produce an electric field
that makes electric charges flow.
What is an electrical
current?
• The flow of electrical charges
• Electrons move along the wire
Unit for Current
• The amount of electrical current in a
wire is the amount of charge that
flows into and out of the wire every
second
• The unit for current is the ampere, A
• 1 ampere of electric current means
about six billion billion electrons
flowing into and out of the wire
every second
A Simple Electric Current
• Electric energy can be transformed
into heat, light, and sound energy
• To watch tv energy must be
constantly transformed
• The electric current must be kept
flowing
A Simple Electric Current
• Electric current will flow continually in a
CLOSED path called an electrical circuit
A Simple Electric Circuit
• An electrical circuit is made
up of:
– wire, which connects the parts
together
– an energy source, such as a
battery
– a receiver, such as a fan,
lightbulb, or motor
– a switch (not required)
A Simple Electric Current
• Current flows as long as the switch
is closed
• When the switch is open, current no
longer flows
• If one of the wires are cut or the
light bulb is unscrewed the current
will not flow
Making Electric
Charges Flow
• A force must be exerted on electric
charges to make them flow
• Force is exerted on an electric
charge by an electric field
• There is an electric field in the
circuit that will move electrons in a
single direction
Making Electric
Charges Flow
• A battery can produce an electric
field
– Electrons flow from the negative
end to the positive end
What did you learn?
• True or False
– In a wire there is an electric current
when protons in the wire move along
the wire.
– The unit for electric current is the
ampere.
– Electric currents will flow when a
switch is open.
– Batteries can produce an electric field
that makes electric charges flow.