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Formula Sheet
cos
M
Bd
A
B
A
θ
Φ=
⋅
=
∫
G
G
M
induced
d
VN
dt
Φ
=−
(/
)
Fe
v
B
e
E
evB
e V
d
V
vdB
=×
=
−
==
G
GG
G
LI
Φ =
2
0
M
NA
NBA
I
l
μ
=
0
inside
N
B
I
l
=
induced
dI
V=
L
dt
−
0
()
(1
)
Rt
L
It
e
R
−
E
2
1
2
UL
I
=
0
C
C
l
I
⋅=
∫
G
G
0
2
4
I
B
R
π
=
G
0
2
2
4
Ir
B
R
=
G
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View Full Document PHY 2049C – General Physics B
Fields, Circuits, Waves, Light
Today:
1) Power in AC circuits
2) RLCcircuits: oscillation
3) AC circuits:“Reactance”
and “Impedance”
Resistance  Reactance
Resistor:
Current in Phase with Voltage,
Resistance
Capacitor:
Voltage runs behind Current ,
Reactance
(decreases with increasing frequency)
Inductance:
Voltage runs ahead of Current,
Reactance
(increases with increasing frequency)
at
0
°
R
R= const V = R I
phase
⋅
1
at
90 phase
°
CC
C
X=
V
=
X
I
C
ω
−
at
90 phase
°
LL
L
L
V
=
X
I
+
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View Full Document Power into
Inductance / Capacitance
What is the power delivered by AC
to an Inductance L ?
Power is
delivered
to the Inductance,
Power is
returned
by the inductance
On Average:
No power
()
() () ()
Peak
Peak
cos t
sin
cos
sin
Vt=V
It=
I
t
P
t=
V
t
t
t
ω
⋅
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This note was uploaded on 06/29/2010 for the course PHY2049C PHY2049C taught by Professor Duke during the Summer '10 term at FSU.
 Summer '10
 DUKE

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