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Electric Currents & Circuits
AP – Ch 20 & 21
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Teaching LAB
• YOU teach–Simple Circuit–Series Circuit–Parallel Circuit–Combo Circuit–Kirchoff’s Laws
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Ch 20 & 21 Outline
• 1st Half of PPTX– New stuff from OpenStax text
• 2nd Half– My old stuff
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Current
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Figure 20.2
• The rate of flow of charge is current. An ampere is the flow of one coulomb through an area in one second.
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Note Direction of I…
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Conventional Current
Physical Current
+
+
-
-
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exC 181025.61
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Ohm’s Law
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Ohm’s Law
• Started as two proportions–I through a RESISTOR V drop–I through a RESISTOR 1/R of resistor
• Put together:
RVI
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Ohmic Material
• Any material where R is independent of I and V– Most metals & common conductors
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Resistivity
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Electrical Power
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Intro Stuff
• Power–Same as regular P, but different
IVPt
qVP
t
WP
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Intro Stuff
• Power…
WattsR
VV
R
VP
RIIRIP
IVP
2
2)(
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Sect 20.6: Hume Bean Hazards
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Ch 21: Circuits
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Intro Stuff
• Electromotive Force–emf•Maximum V of battery
• Current–Flow of charge
t
qI
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Intro Stuff
)(Ampere
As
C
t
qI
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Intro Stuff
• Ohm’s Law–States linear relationship
between V & R
))(( OhmAmpVolt
IRV
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Intro Stuff
• Resistance–Says what it means•e- has to ‘fight’ thru a wire or ‘resistor’
A
LR
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A
LR
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Intro Stuff
• Resistance–Radio Shack SCAM!
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Intro Stuff
• Resistance–Radio Shack SCAM!
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CONVENTIONAL Current
ELECTRON Current
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CONVENTIONAL Current
ELECTRON Current
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Intro Stuff
• Power–Same as regular P, but different
IVPt
qVP
t
WP
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Intro Stuff
• Power…
WattsR
VV
R
VP
RIIRIP
IVP
2
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Intro Stuff
•Wiring Circuits–Series / Parallel•Parallel
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WHY? C//
VC
QQQ
1
321...
...
...
...
321
332211
321
CCCC
VCVCVCCV
QQQQ
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WHY? CSeries
VC
QQQ
1
321...
...1111
...
...
321
321
321
CCCC
CQ
CQ
CQ
CQ
VVVV
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Quantitative Summary
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221
r
qkqF
Coulomb’s Law:Force between any 2 charges
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q
FE
Electric Field Strength:Force on test Q
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r
qkqqVUE
21
Electric Potential Energy:Fd
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d
VE
Electric Field (av):Potential at a distance
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...2
2
1
1
r
q
r
qk
r
kqV
Electric POTENTIAL:NOT a vector…
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V
QC
Capacitance:Property of Capacitors
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d
AC o
Capacitance:Property of Capacitors
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2
2
1
2
1CVQVUC
Energy stored in Capacitor:
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t
QI
Definition of Electrical Current:SI Unit - Amps
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t
QI
Definition of Electrical Current:SI Unit – Amps (A)
sec1
1025.61
sec1
11
18
exA
CA
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Resistance in a WIRE:SI Unit – Ohms ()
A
LR
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OHM’S LAW:All Circuits Must Obey…
IRV
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OHM’S LAW:All Circuits Must Obey…
IRV
12V 6
AV
R
VI 2
6
12
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Electrical Power:From P=W/t
R
V
RI
IVP
2
2
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Series Circuits
...
...
...
21
21
21
VVV
III
RRRR
S
S
S
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Parallel Circuits
...
...
...111
11
21
21
21
VVV
IIII
RRR
R
P
P
P
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Circuits w/Capacitors
...111
11
21
CCC
CS
...1111
...
...
321
321
321
CCCC
CQ
CQ
CQ
CQ
VVVV
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Circuits w/Capacitors
...21 CCCCP
...
...
...
321
332211
321
CCCC
VCVCVCCV
QQQQ
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EXAMPLE #1• Three 12 resistors are used in two circuits; one in
series and one in parallel. What is the Requivalent of each circuit?
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Series
12 12 12
36121212
321 RRRRREq
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Parallel12
12
12
43
12
1231
121
121
121
11
1
R
REq
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Series + Parallel12
12
12
612
18
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