How to calculate Resistance from Voltage Drop

mvyrmnd

Flashlight Enthusiast
Joined
Sep 4, 2009
Messages
3,391
Location
Australia
Hi all,



I'm not much of a numbers guy, so I'm struggling to wrap my head around this one.



I have an Elektrolumens MCE-III Mag. I've done every resistance mod I can find to try and bump up it's output, with great success.



I'd like to know how much resistance the entire system has, so I can compare it with a stock Mag.



Say I have my 3 26650's in it. Their voltage combined is 12.6V.



If i take the head off the mag, turn on the switch and measure the voltage at the two contact points and get 12.5V (I haven't actually got a measured figure yet, the batteries are charging - let's just use this for a sake of the calculation), how can I calculate the resistance in the system that sapped away that .1V?



Please explain?
 
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