led datasheets

[karlosk98]

when you read in led datasheets, supose 1500 mA, do they mean miliamperes in hours (mAH)? Thanks

 

[elgarak]

They mean mA -- current in milli-Amperes. wiki on Ampere

Ampere-hours is used as a capacity number for batteries (can provide that many amperes for one hour, 1/2 that current for two hours etc.).

Since current = charge / time [Ampere = Coulomb/s], current * time = charge [A* sec = coulomb].

Ah is an electric charge!

1 Ah = 3600 Coulomb. 1 mAh = 3.6 Coulomb. Cause 1 hour = 3600 sec.

 

[elgarak]

You can actually calculate how many electrons come out of the battery!

1 Coulomb = 6.241506*10^18 electrons.

Therefore: 2500 mAh AA battery stores: 2500*3.6*6.241506*10^18=5.6173554*10^22 electrons.