In real this how a capacitor looks like
Electrolytic or Polarized 
Disc or Ceramic 
The circuit symbol of capacitor is
Electrolytic or Polarized 
Disc or Ceramic
Functions of capacitor
the capacitor function is to store energy or electric charge.
How is it measured..??
The measure of capacitor (the capacitance), is designated in units called the Farad ( F ).
The value of capacitance depends on what..??
The capacitance of a capacitor is generally very small, so units such as the microfarad ( 10-6F ), nanofarad ( 10-9F ), and picofarad (10-12F ) are used.Recently, an new capacitor with very high capacitance has been developed. The Electric Double Layer capacitor has capacitance designated in Farad units. These are known as "Super Capacitors".
How capacitance is represented in capacitor..??
This table is designed to provide the value of alphanumeric coded ceramic, Mylar and mica capacitor in general. They come in many sizes, shapes, values and ratings; many different manufacturers worldwide produce them and not all play by the same rules. Most capacitors actually have the numeric values stamped on them, however, some are color coded and some have alphanumeric codes. The capacitor's first and second significant number IDs and are the first and second values, followed by the multiplier number code, followed by the percentage tolerance letter code. Usually the first two digits of the code represent the significant part of the value, while the third digit, called the multiplier, corresponds to the number of zeros to be added to the first two digits. After that, the differences may show up. Use this information as a guideline and at your own risk. If you are in question, try to locate the original manufacturer and seek information from that source.
VALUE TYPE CODE VALUE TYPE CODEGeneral code breaking information of the capacitor
1.5pF Ceramic 1,000pF / .001uF Ceramic / Mylar 102
3.3pF Ceramic 1,500pF / .0015uF Ceramic / Mylar 152
10pF Ceramic 2,000pF / .002uF Ceramic / Mylar 202
15pF Ceramic 2,200pF / .0022uF Ceramic / Mylar 222
20pF Ceramic 4,700pF / .0047uF Ceramic / Mylar 472
30pF Ceramic 5,000pF / .005uF Ceramic / Mylar 502
33pF Ceramic 5,600pF / .0056uF Ceramic / Mylar 562
47pF Ceramic 6,800pF / .0068uF Ceramic / Mylar 682
56pF Ceramic .01 Ceramic / Mylar 103
68pF Ceramic .015 Mylar
75pF Ceramic .02 Mylar 203
82pF Ceramic .022 Mylar 223
91pF Ceramic .033 Mylar 333
100pF Ceramic 101 .047 Mylar 473
120pF Ceramic 121 .05 Mylar 503
130pF Ceramic 131 .056 Mylar 563
150pF Ceramic 151 .068 Mylar 683
180pF Ceramic 181 .1 Mylar 104
220pF Ceramic 221 .2 Mylar 204
330pF Ceramic 331 .22 Mylar 224
470pF Ceramic 471 .33 Mylar 334
560pF Ceramic 561 .47 Mylar 474
680pF Ceramic 681 .56 Mylar 564
750pF Ceramic 751 1 Mylar 105
820pF Ceramic 821 2 Mylar 205
| General Capacitance Codebreaker Information | |||
|---|---|---|---|
| PicoFarad (pF) | NanoFarad (nF) | MicroFarad (mF,uF or mfd) | Capacitance Code |
| 1000 | 1 or 1n | 0.001 | 102 |
| 1500 | 1.5 or 1n5 | 0.0015 | 152 |
| 2200 | 2.2 or 2n2 | 0.0022 | 222 |
| 3300 | 3.3 or 3n3 | 0.0033 | 332 |
| 4700 | 4.7 or 4n7 | 0.0047 | 472 |
| 6800 | 6.8 or 6n8 | 0.0068 | 682 |
| 10000 | 10 or 10n | 0.01 | 103 |
| 15000 | 15 or 15n | 0.015 | 153 |
| 22000 | 22 or 22n | 0.022 | 223 |
| 33000 | 33 or 33n | 0.033 | 333 |
| 47000 | 47 or 47n | 0.047 | 473 |
| 68000 | 68 or 68n | 0.068 | 683 |
| 100000 | 100 or 100n | 0.1 | 104 |
| 150000 | 150 or 150n | 0.15 | 154 |
| 220000 | 220 or 220n | 0.22 | 224 |
| 330000 | 330 or 330n | 0.33 | 334 |
| 470000 | 470 or 470n | 0.47 | 474 |
capacitors in series
the equivalent capacitance for series circuits is c=1÷(c1+c2+c3+....)
capacitors in parallel
the equivalent capacitance for parallel circuits is c=(c1+c2+c3+...)
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