Download - Ye olde capacitor 8.3
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YE OLDE CAPACITOR8.3
InstructorCourse
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Today & Beyond
Quiz Material on Capacitors not in the unit. Complete the unit (9)
SPRING BREAK
RETURN Monday – Begin Unit on Magnetism. (Bring to
class) Wednesday – EXAMINATION #2 / Bring in units
4-9 / Lab Reports Due. Friday – Continue magnetism unit.
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What is the current through the 4- resistor in this circuit?
a) 0.67 A
b) 0.75 A
c) 1.0 A
d) 1.5 A
e) 4.5 A
Text Answer
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DIELECTRIC
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Polar Materials (Water)
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Apply an Electric Field
Some LOCAL ordering Larger Scale Ordering
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Adding things up..
- +Net effect REDUCES the field
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Non-Polar Material
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APPLICATION OF GAUSS’ LAW
qqq
and
A
qE
E
A
qqE
A
qE
'
'
0
0
0
00
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We can measure the C of a capacitor (later)
C0 = Vacuum or air Value
C = With dielectric in place
C=C0
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Dielectric Breakdown!
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Recall the experiment –
Voltage across C seemed to drop rather than stay stable.
You were given a second capacitor and it held it’s value.
What’s going on??? meters have resistors of 1-10M
14
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15
Let’s talk about this…
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20.13 RC Circuits
Capacitor charging
RCto eqq 1
RCtime constant
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20.13 RC Circuits
Capacitor discharging
RCtoeqq
RCtime constant
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Stored Energy
Charge the Capacitor by moving q charge from + to – side.
Work = q Ed=q(V/d)d=qV
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W=qV=Sum of strips
0V
0Qq
V
20
00
00
2
1
2
1
CVW
CVQ
VQqVW
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20
20
20
2202
2
1
)(2
1
2
1
2
1
2
1
EVol
WityEnergyDens
VolEdAEW
dEd
ACVW
Energy Density
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A Thunker
Find the equivalent capacitance between points a and b in the combination of capacitors shown in the figure.
V(ab) same across each
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Let’s Finish the Unit