Question: how many joules in 1 amp?
Answer: For any voltage, mAh X voltage x 3.6 = Joules of energy. As we saw above, since a mAh is 1/1000 of an Ah, to convert Ah (amp hours) to Joules just use 1000 x 3.6 = 3600 as the conversion factor instead of 3.6.