Physics 202
Thursday, Apirl 22, 1999
Announcements:
1. AC and RLC Circuits will be covered on April 22 and 27
2. Suggested HW problems that will not be collected : Chapter 33: 47, 51, 53,
65, 85, 87
The answers will be posted on April 29
3. Maxwell's equations will be covered in lecture on April 29. Expect 1 to 2
qualitative questions on the final
4.Recitation Instructors will annouce "normilazation" policy for recitation grade.
5. "Normilazation" of lab grade will be announced next Tuesday.
6. More information on final will be announced in Tuesday and Thursday's
lecture.
Lecture notes:
Capacitive Load
•
ξ = ξ
max
sin
ϖ
t v
c
= V
c
sin
ϖ
t
o
q
c
= cv
c
= cV
c
sin
ϖ
t
o
i
c
= dq
c
/dt =
ϖ
cV
c
cos
ϖ
t
•
See Figure 339b
•
Note that cos
θ
= sin (
θ
+90)
o
Therefore: i
c
=
ϖ
cV
c
cos
ϖ
t =
ϖ
cV
c
sin (
ϖ
t + 90
o
)
o
v
c
= V
c
sin
ϖ
t
o
Therefore, i
c
leads v
c
by 90
o
or
π
/2 radians. They are out of phase
by 90
o
.
o
See the phasor diagram in the text (Figure 339c
•
For a capacitive load: i
c
=
ϖ
cV
c
sin (
ϖ
t + 90
o
) = = V
c
sin (
ϖ
t + 90
o
)/ X
c
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o
X
c
= 1/
ϖ
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 Spring '07
 MAHLON,GREGORYDA
 Physics, Magnetism, Inductor, RC circuit, LC circuit, VL sin

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