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Acid Mods Community Area => Discussion Boards => Beginners Corner => Topic started by: mikespartian114 on October 03, 2009, 09:38:20 PM

Title: how do i figure out foward current mA?
Post by: mikespartian114 on October 03, 2009, 09:38:20 PM

like the subject says:

how do i figure out foward current mA.





deda: use a normal subject otherwise no one will even bother to look

Title: Re: how do i figure out foward current mA?
Post by: 802Chives on October 13, 2009, 08:46:39 AM

V = I*R


your welcome lol......



In LEDs it is [Vsupply-Vf(led)]/Rlimit = Forward Current

so if you have 5Vsupply 3Vf and you are looking for 20mA you can rearrange and solve for Rlimit

[Vsupply-Vf(led)]/Forward Current = Rlimit

[5-3]/0.020 = Rlimit = 100ohm

Title: Re: how do i figure out foward current mA?
Post by: dedafmonteur on October 13, 2009, 09:43:54 AM

maybe download the program: crocodile clips.

you can build evry electronic scematic in there

Title: Re: how do i figure out foward current mA?
Post by: ProperBritish on October 13, 2009, 11:40:38 AM

yes V=IR

which rearrages to any of the following

V/I = R
V/R = I

where:
V = Potential Difference in Volts
I = Current in Amps
R = Resistance in Ohms

Title: Re: how do i figure out foward current mA?
Post by: o987654321 on January 17, 2010, 10:48:36 AM

thanks for this helping tutorial