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> Capacitor Measurements?, uf means exactly what???
LEDdummy
Posted: November 20, 2007 02:57 pm
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Hey guys and gals.
I'm curious if anyone can give me a detailed description of what exactly the
capacitor ratings are?
I know its all farads. and the uf is a micro-farad.
But what exactly does that mean?

say whats the difference in a uf 0.1
and a uf 1.0 or uf 100 and so on? blink.gif

Thanks!!!!!


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mankku
Posted: November 20, 2007 03:01 pm
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Micro- is a prefix that means "millionth of a ...". So 1 uF is one millionth of a Farad, or 0.000001 F. That's to say micro is a prefix just like milli-, nano-, pico- etc.

Wikipedia link that explains the SI prefixes.

The difference between 0.1 uF and 1 uF is just a matter of maths: the difference is 0.9 uF. A capacitor that is 1 uF has bigger capacitance than a 0.1 uF.

Mankku
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danga1993
Posted: November 20, 2007 03:45 pm
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Basically it can store more charge than a smaller capacitor.

E.g a 1 uf capacitor charged to 10v will release less total power (Voltage x Current) than a 100uf capacitor charged to 10v.

Cheers biggrin.gif
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draget
Posted: November 21, 2007 02:49 am
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capacitance = charge stored per volt

i.e. farads = couloumbs / volts
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Papabravo
Posted: November 22, 2007 01:15 am
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Larger capacitors have smaller impedances. Impedance is a complex quantity with a real part and an imaginary part. The value of the imaginary part is:
CODE


(2*pi*f*C)^-1

where pi = 3.1415926...
and f is frequency in Hertz (cycles per second)
and C is capacitance in Farads

Increasing either the frequency OR the capacitance makes the imaginary part of the impedance tend toward small vlaues. Conversely small capacitance and low frequency makes the imaginary part of the impedance tend toward large values.


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tekwiz
Posted: November 22, 2007 02:58 am
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Capacity is just that, capacity. Large capacitors hold more charge than smaller ones. It turns out that a farad is a rather cumbersome amount of capacity, so most of the capacitors in use are a small fraction of a farad, hence the prefixes.
Multi farad capacitors are available, but only in low voltages. They are used for memory maintenance, & as stiffening capacitors in car audio systems. cool.gif


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