4 ms·
I was sure you had the math wrong on that battery to mass comparison. For number appears to be very accurate. I'm going to have to recalibrate my idea of how m
by jws 11y ago
I was sure you had the math wrong on that battery to mass comparison. For number appears to be very accurate.
I'm going to have to recalibrate my idea of how much energy a AA holds and also physical work compared to running electronics.
- logfromblammo 11y agoYeah, I thought it was wrong, too--even after doing the math. One joule is a kilogram meter squared divided by seconds squared (J = kg m^2 s^-2) . And Earth surface gravity is about 10 m s^-2. So one ton raised one meter is 1000 kg x 1 m x 10 m s^-2, or 10000 J. An AA (LR6) battery is about 600-3400 mAh, depending on composition. A joule is also a coulomb-volt, or ampere-second-volt. So an alkaline AA battery with 2500 mAh and nominal voltage 1.5V is 2500 mAh x .001 A/mA x 3600 s/h x 1.5 V = 13500 J. A NiMH AA with 2300 mAh at 1.2 V is 9936 J.