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Help, Capacitor Project

 
 
Junior Member
Join Date: Dec 2009
Posts: 5
 
      01-26-2010, 03:52 PM
I'm in charge of helping my son with his electronics project on capacitors. I have *no* background in electronics whatsoever, so I'm way out of my element.

I put the cart before the horse and purchased the following equipment:

1. A 1 Farad "super" capacitor from an electronics store: 1 Farad, 5.5 Volts. High-capacitance, memory back-up capacitor. Slowly releases its charge to provide back-up power in temporary shut-down situations. 0.78" diameter x 0.30" thick. PC leads on 0.2" centers.

2. A Hand Generator from a science supply store with a max output of 6.5V DC.

3. A 1.5V 0.3A bulb from radio shack.

I thought that the capacitor would store enough to power the bulb. My sons teacher told me that the bulb requires too much current and would not be useful. I'm stuck here: I don't even know how to hook up the red and black leads to the capacitor, let alone find something useful to do with the stored energy in the capacitor. I thought of an LED bulb, but think the voltage would be too high for it?? Help! Any ideas here would be greatly appreciated!
 
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Super Moderator
Join Date: Jul 2009
Posts: 1,009
 
      01-26-2010, 09:14 PM
Super caps comes in different types. Some are not meant to be loaded with more than small memory backup currents, while others can supply several amps - easily running motors and lamps. I've even seen'em used in electric r/c helicopters..
I'm quite sure the cap you got will be capable of blowing that lamp. Get a 4.5-6V lamp or hand-held fan instead.
A LED must have a suitable resistor to limit the current through it or else it'll blow instantly. Some electronic LED drivers can supply a constant current to the LED regardless of the applied voltage.
A 1 Amp current will increase or decrease the voltage across a 1 Farad capacitor with 1 Volt per second, so a 0.3A lamp will (in theory) light for up to 18 seconds.
Just connect (wrap) red wire to + and black wire to - and try it out.
 
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