[Lab] Odd Question

[Michael]

Other things to consider that may effect combustion...
100 C is likely the vapor flash point within a narrow air:fuel ratio.
Submersion in vegetable oil would probably keep the oxygen out but...

A mixture will have entirely different properties depending on the 
components.
Other reactions besides oxygen + fuel could occur or be catalyzed by 
heat + electricity...
For example chlorine is a strong oxidizer, a candle will readily burn in it.

Have fun!

Michael
http://n0m1.com/
http://krazatchu.ca/





On 1/20/2012 3:15 PM, Emily Daniels wrote:
> Wow! Thank you for that deduction Michael! That is way better than I 
> could have ever done. Inside the cell will be sealed off from air but 
> the outside top is exposed, unless I seal that off too. Ideally the 
> thing will fluoresce and emit a steady glow from the energy generated 
> from the oscillations in the Rochelle and Epsom salts with even a 1.5 
> or 3 volt battery, 9 volt is the highest I'd like to go. Guess I'll 
> find out...
>
> On Fri, Jan 20, 2012 at 3:00 PM, Michael <krazatchu at hotmail.com 
> <mailto:krazatchu at hotmail.com>> wrote:
>
>     This is a interesting challenge..
>
>     The supply droop with resistive load will be a factor of the
>     batteries internal resistance.
>     Which is an effect of temperature, chemistry and state of charge.
>
>     Internal resistance can be measured by subjecting the battery to a
>     known load ...
>     http://en.wikipedia.org/wiki/Internal_resistance
>     Then applying (Nominal V - Loaded V) * (Load R) / (Nominal V)
>     Or you can just figure it's about 0.2 Ohms per Alkaline cell.
>     A 9V is sometimes made of 6 cells, so about 1.2 Ohms.
>
>     Once you have the internal resistance figured...
>     The circuit is a 9v voltage source with two series resistances,
>     internal + load.
>     The voltage drop over the internal resistance will be 9 - 6 = 3v
>     and using i = V/R we get the current over the internal resitance...
>     i = 3/1.2 = 2.5 Amps (there's going to be some serious self
>     heating which will skew the results)
>
>     As the circuit is series, the current thru the internal resistance
>     is the same as the current thru the load...
>     And the final voltage drop over the unknown load is the remainder,
>     6 volts. Using R = V/i...
>     R = 6 / 2.5 = 2.4 Ohms ...
>
>     Finally heat is a factor of power dissipation...
>     Power is V*i = 6 * 2.5 = 15 Watts...
>
>     I just tested this with a Rayovac 9v and a 2.7 ohm load...
>     The results were a bit off, the internal resitance of the rayovac
>     must be higher than 1.2 ohms
>     I got a supply drop to 3.4 volts and a 1.15 amps current.
>     Using the above calculation, the rayovac has an internal
>     resistance of 1.73 ohms..
>     So we could probably guess between 10 to 12 watts of power lost
>     into load...
>
>     Temperature rise is a factor of thermal conductivity and geometry...
>     I'd guess that the sugar cell has a pretty low thermal
>     conductivity and that 10 watts could heat a sugar cell to over
>     100c given enough time..
>     Combustion is going to require an oxidizer so YMMV....
>
>     Michael
>     http://n0m1.com/
>     http://krazatchu.ca/
>
>
>
>     On 1/20/2012 1:49 PM, Darcy Whyte wrote:
>>
>>     I suppose if you can try it on a couple and see what the current
>>     is, then you can know how many Watts. That would be a start. Then
>>     you just have to figure out how much of the heat is in the load
>>     and how much is in the battery. You can probably do that by
>>     knowing the resistance of the load.
>>
>>
>>
>>
>>     On Fri, Jan 20, 2012 at 1:33 PM, Emily Daniels
>>     <emily.daniels at gmail.com <mailto:emily.daniels at gmail.com>> wrote:
>>
>>         Hi All,
>>
>>         Does anyone know how much heat is produced by a 9 volt
>>         battery when the resistance of the material it flows through
>>         reduces it to 6 volts? What would the temperature be inside
>>         the material? Thanks!
>>
>>         Emily
>>
>>         -- 
>>         Emily Daniels | emilydaniels.com <http://emilydaniels.com> |
>>         @emdaniels | awesomefoundation.org <http://awesomefoundation.org>
>>
>>
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>>
>>
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>
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> -- 
> Emily Daniels | emilydaniels.com <http://emilydaniels.com> | 
> @emdaniels | awesomefoundation.org <http://awesomefoundation.org>
>


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