# Physics Talk 6.2

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First found May 22, 2018

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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
Notebooks are out and
pencils are recording
information from the
board
Students must raise
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


 Speak at a whisper with your neighbor







Potential energy
Electric potential
energy
Battery
Resistor
Coulomb
Current






Voltage
Volt
Joule
Ampere
Series circuit
Watt
Expectations