Sparkfun Capacitor Kit : $7.95
Digikey 10000uF (0.01F) capacitor $3 each
The energy stored in a capacitor is electrostatic potential energy and is thus related to the charge Q and voltage V between the capacitor plates. A charged capacitor stores energy in the electrical field between its plates.
Capacitance: the ability of a system to store an electric charge. The ratio of the change in an electric charge in a system to the corresponding change in its electric potential.
Capacitor: a device used to store an electric charge, consisting of one or more pairs of conductors separated by an insulator.
Coulomb: the SI unit of electric charge, equal to the quantity of electricity conveyed in one second by a current of one ampere. The coulomb (symbol: C) is the International System of Units (SI) unit of electric charge. Under the 2019 redefinition of the SI base units, which took effect on 20 May 2019, the coulomb is exactly 1/(1.602176634×10 ) elementary charges. The same number of electrons has the same magnitude but opposite sign of charge, that is, a charge of −1 C.
Farad: the SI unit of electrical capacitance, equal to the capacitance of a capacitor in which one coulomb of charge causes a potential difference of one volt.
1 Farad = 1000mF = 1 million uF = 1 billion nF = 1 trillion pF
m = milli
u = micro
n = nano
p = pico
2 digit markings mean pF: 22 = 22 pF
3 digit marking: 104 = 1 and 0 is 10. 4 represents 10^4 so 10 x 10^4 or 100,000pF = 104: 100,000 pF = 100nF
Let’s look at what a Farad and Ampere-Hour is?
1 F = 1 As/V
1Ah = 3600As
Maintain 1Ah @ 12V you would need?
|EIA Tolerance Capacitor Marking Code|
|Z||+80%, -20% – this is used with electrolytic capacitors where the minimum value is the major issue.|
|EIA Capacitor Voltage Codes|
|0G = 4.0VDC||1J = 63VDC||2D = 200VDC *|
|0L = 5.5VDC||0k = 80VDC||2P = 220VDC|
|0J= 6.3VDC *||2A = 100VDC *||2E = 250VDC *|
|1A = 10VDC *||2Q = 110VDC||2F = 315VDC|
|1C = 16VDC *||2B = 125VDC||2V = 350VDC|
|1E = 25VDC *||2C = 160VDC||2G + 400VDC *|
|1H = 50VDC *||2Z = 180VDC||2W = 240VDC|