Physics Talk 6.2

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
LO:


Use a physical model to
describe the flow of
electric charges in series
and parallel circuits.
SC:


Develop a physical
model for electric current
and potential energy
Use this physical model
to trace the flow of
electric charges in series
and parallel circuits.

DO NOW:



Write LO and SC on
new left side page
WDYS/WDYT-pg.
606
Investigate
 Part A: vocabulary with
pretzels





Students assemble like picture on page 607.
Teacher = switch
1 student = battery
1 student – light bulb
Rest = charges (only charged when student has
pretzel in their hand)

Round 1



Battery=energy supply=joules=pretzels
Light bulb=dancing student
Electric charges=coulomb=students

Round 2:

Battery=energy supply=joules=pretzels
 “I am one VOLT, which means, I am one joule (pretzel)
of energy to each coulomb (student)”
 “Please move along, one coulumb (student) per second
is one amp of current”

Light bulb=dancing student
 “I just received one joule (pretzel) of energy from that
coulomb (student)

Electric charges=coulomb=students
 “I just gained one joule of energy from the battery”
 “I just gave one joule of energy to the light bulb”

Round 3


Battery is 3 Volts
Gives each coulomb 3 joules of energy

Round 4


Battery is 1 Volt
Current is 2 amps=2 coulombs per second

#9 page 608: a, b, c, d, e, f

LO:


Use a physical model to
describe the flow of
electric charges in series
and parallel circuits.
SC:


Develop a physical
model for electric current
and potential energy
Use this physical model
to trace the flow of
electric charges in series
and parallel circuits.

DO NOW:


Describe the
difference between a
joule and a volt.
Agenda

Investigate
 Part B: vocabulary with
pretzels

Series circuit



2 light bulbs, each must get some energy
Battery is 1 Volt
Charges have to spread their joule (pretzel) to each
light bulb equally


#2 a
#3 a, b, c, d






1V battery = 1 J of energy (pretzel) for each
coulomb (student) of charge
Charges flowed at the rate of 1 amp (or 1
coulomb per second=1 student per second)
The # of Joules (pretzels) per second that a bulb
receives determines how BRIGHT the bulb is
Joules per second=Power (measured in Watts)
1 Watt=1 Joule/sec
Which will be brighter? A 100-W bulb or a 40W bulb? Why?

#4a: copy table at top page 609






Potential energy
Electric potential
energy
Battery
Resistor
Coulomb
Current






Voltage
Volt
Joule
Ampere
Series circuit
Watt

LO:


Use a physical model to
describe the flow of
electric charges in series
and parallel circuits.
SC:



Develop a physical
model for electric current
and potential energy
Use this physical model
to trace the flow of
electric charges in series
and parallel circuits.
DO NOW:


Find the joules per
second for a 3 volt
battery, with a 5 amp
current.
Investigate
 Part A: vocabulary with
pretzels

Volume


Actions


Questions?

Finished with the slide?


Students are quiet and
headphones are off
Notebooks are out and
pencils are recording
information from the
board
Students must raise
their hand to ask or
answer questions.
Please wait patiently
without talking or
distracting your
neighbor

How is your
bloodstream similar
to an electric current?

Like blood cells,
electrons carry energy
to the light bulb. The
energy is used up
(pretzel/joule), but
the electron is not
(student)

What is electrical
potential energy?

Energy that has not yet
been used up and is
being held by an
electron or battery

What is a resistor?

An object in an
electrical circuit that
consumes energy.
This object will often
determine how
quickly the electrons
can pass by (current)

An explanation of the
electron shuffle

What is a series
circuit?


An electrical circuit
where there is only
one path for the
electrons to follow
The electrons move
with the same current
throughout the entire
circuit

How do we represent
a series circuit?

What determines the
brightness of a light
bulb?
VA
W
R






The number of Watts,
or Joules per second.
You can use the
following equation for
a series circuit (thank
you Ayo and Arthur)
W = Power
V= Volts
A= current (amperes)
R = resistors, or
number of light bulbs

What does it mean?
How do you know?
Why should you care?

Expectations


Stay in your seat
 Speak at a whisper with your neighbor
 Record Answers in notebook







Potential energy
Electric potential
energy
Battery
Resistor
Coulomb
Current






Voltage
Volt
Joule
Ampere
Series circuit
Watt
Expectations
Stay in your seat
Speak at a whisper with your neighbor
Record Answers in notebook
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