Re: 9.5 questions on capacitor, LED, resistor

Sorry to be that clear: it seems that you are missing some fundamental
concepts. For a first introduction you may visit the following Webbook:

Capacitors: http://www.vias.org/feee/cap_02.html
LEDs: http://www.vias.org/feee/diode_11_03.html
Resistors: http://www.vias.org/feee/ohm_02.html

Hope this helps,

Hans


--
=====================================
Hans Lohninger
EPINA GmbH - Software Development Lohninger
www.lohninger.com
======================================

<leon.park@xxxxxxxxx> wrote in message
news:1129881685.570623.286590@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
> 1. Fast charging capacitors-Possible? Is the charging speed of a
> capacitor determined by the input voltage and current?
>
> 2. I don't understand the differences between these myriad of capacitor
> chemistries. But I'm looking at aerogel caps. Does output voltage stay
> constant while current varies?
>
> 3. Also, do capacitors accept charge from an a/c source or will it need
> a diode?
>
> 4. LEDs require a resistor, but how do you calculate the required
> resistance if you connect the LEDs in series?
>
> 4.5. Then the voltage has dropped across each LED, yes?
>
> 5. What determines the capacity of a resistors resistance, i.e., what
> is the max voltage/amperage input of a resistor with impedance x. Or do
> I have it all wrong and is impedance rated at the specified input
> power?
>
> 6. Is the power sent through a resistor merely attenuated or burnt off
> as heat?
>
> 7. Will a resistor pass proportionally more power through if less than
> the power the resistor is rated at is experienced?
>
> 8. Can caps handle overvoltage/overcharge (unlike a battery)?
>
> 9. Are cap chemistries what determine a caps discharge rate? Are carbon
> aerogel caps "fast?" What do they use for railguns?
>
> And because I'm too lazy to look it up, is there a simple way to figure
> how many watts/hour a cap of capacitance xF will put out before
> draining?
>


.

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