I've got 15 devices each with a current of 20mA and I am interested in running them all for 10 seconds. How would I go about working out the amount of mAh a battery would need to provide for this?
I understand that to find the mAh to run something for an hour you take the current and multiply it by 1000 and so my understanding of his problem was that you could get minutes by multiplying by 100 and then seconds by 10. So What I thought I needed to do was something like this:
15 x 20mA = 300mA/0.3A
0.3 x 10 = 3
3 x 10(seconds of runtime) = 30mAh
However I am not sure if this is right, so I would be grateful if someone could look it over and point out my mistakes.
Answer
I = 15 * 20mA = 300mA
t = 10s
x = 300mA * 10s = 3000mAs = 3000mAs/3600s = 0.8(3) mAh
That is a small amount of electric charge.
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