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FreeTrack Forum > FreeTrack : English Forum > Support : Tracking System > easy build current calculation

RSS >  easy build current calculation, i am puzzled how the current was calculate by the OP
xxtraloud #1 16/04/2012 - 18h29

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Okay I am a bit confused by how the current on each LED was calculated. The formula is I=V/R, so for example the parallel circuit.
With rechargeable batteries and 18 ohm resistors:
I=2.4/18ohm = 0.13A = 133mA in a parallel circuit the current that goes into every resistor varies accordingly to every resistor, but in our case they are all the same. So could someone explain how the OP came up with the 50mA current for each LED?

The calculation in the series circuit is ok.

Thanks
Gian92 #2 16/04/2012 - 19h22

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Registered on : 08/04/2012

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Put the LEDs in series, less hassle and you use only one resistor, if need be.
“Ordem e progresso” - Brazilian flag

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