| Capacity of a Bottle-Cap ( Leyden
Jar ) |
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Original
table from Bert Pool in File CAP.TXT (black entries) |
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Table modified following File TESLA-MATH.TXT |
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| Material: |
PYREX GLASS[1] |
[2] |
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MATERIAL |
"K" = er |
PUNCTURE |
PUNCTURE |
Produkt |
| Da |
H |
s |
"K" = er |
Puncture |
|
|
[ - ] |
[ V / MIL ] |
[ V / mm ] |
K*PUNCT: |
| [cm] |
[cm] |
[mm] |
[ - ] |
[ V / mm ] |
|
|
min |
max |
min |
max |
min |
max |
min |
| 8,6 |
15 |
2 |
4,8 |
13 189 |
|
AIR (dry at 1 atm) |
1,0006 |
|
30 |
70 |
1181 |
2756 |
30 |
|
BAKELITE |
4,4 |
5,8 |
300 |
|
11811 |
|
1320 |
| Outside
surface Aa = |
463,4 |
cm2 |
|
BAKELITE, MICA FILLED |
4,7 |
|
325 |
375 |
12795 |
14764 |
1528 |
| Inside
surface Ai = |
434,1 |
cm2 |
|
Epoxy Circuit Board |
5,2 |
|
700 |
|
27559 |
|
3640 |
| Average A = |
448,7 |
cm2 |
0,04487137 |
m2 |
FORMICA |
4,6 |
4,9 |
450 |
|
17717 |
|
2070 |
|
PYREX GLASS |
4,8 |
|
335 |
|
13189 |
|
1608 |
| Capacity C = eo*er*A / s = |
954 |
pF |
26 378 |
V |
WINDOW GLASS |
7,6 |
8 |
200 |
250 |
7874 |
9843 |
1520 |
| ARRL
Handbook 1957 = |
950 |
pF |
Puncture |
|
MICA |
5,4 |
|
3800 |
5600 |
149606 |
220472 |
20520 |
|
Voltage |
|
Nylon (lowest val of 3types) |
3,2 |
|
407 |
|
16024 |
|
1302 |
| Anzahl |
|
C |
|
PLEXIGLASS |
2,8 |
|
450 |
990 |
17717 |
38976 |
1260 |
| 2 |
|
1907 |
pF |
|
POLYETHYLENE |
2,56 |
2,3 |
450 |
1200 |
35000 |
47244 |
1152 |
| 3 |
|
2861 |
pF |
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POLYSTYRENE |
2,5 |
2,6 |
500 |
700 |
19685 |
27559 |
1250 |
| 4 |
|
3814 |
pF |
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PORCELAIN |
5,1 |
5,9 |
40 |
100 |
1575 |
3937 |
204 |
| 5 |
|
4768 |
pF |
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PVC (rigid type) |
2,95 |
|
725 |
|
28543 |
|
2139 |
| 6 |
|
5722 |
pF |
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QUARTZ |
3,8 |
5 |
1000 |
|
39370 |
|
3800 |
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TEFLON |
2,1 |
|
1000 |
2000 |
39370 |
2000 |
2100 |
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| Capacity
of a Plate Cap with n-Layers (Metal) |
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1 MIL
= 0.001 inch = |
0,0254 |
mm |
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| Material: |
POLYETHYLENE |
[3] |
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| L |
B |
s |
"K" = er |
Puncture |
n |
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| [cm] |
[cm] |
[mm] |
[ - ] |
[ V / mm ] |
[ - ] |
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| 30 |
25 |
0,9 |
2,56 |
35 000 |
24 |
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| Surface of
one plate A = |
750,0 |
cm2 |
0,075 |
m2 |
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| Capacity C = eo*er*A / s = |
43449 |
pF |
31 500 |
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| ARRL
Handbook 1957 = |
43271 |
pF |
Puncture |
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Voltage |
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| Capacity
of a Ball |
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| Material: |
AIR (dry at 1 atm)[4] |
[5] |
(dielectric medium around ball) |
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| DKugel |
"K" = er |
|
CKugel |
= er * ( 0.5* Dkugel ) / 9 |
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| [ mm ] |
[ - ] |
|
[ pF ] |
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| 245 |
1,0006 |
|
13,619 |
pF |
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| Capacity
of a Toroid |
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| Material: |
AIR (dry at 1 atm) |
|
(dielectric medium around torus) |
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| d1 =
outside diameter of toroid in inches |
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| d2 =
diameter of cross section (cord) in inches |
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| CTorus = [ 1+(0.2781-d2/d1) ] * 2.8 * sqrt{ p*(d1-d2)*d2 / 4 } |
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Equation courtesy of Bert pool |
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| d1 |
d2 |
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CTorus |
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| [ mm ] |
[ mm ] |
|
[ pF ] |
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| 550 |
100 |
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22,719 |
pF |
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| [ inch ] |
[ inch ] |
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| 21,65 |
3,94 |
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