3 ms·

Pumped storage is quite low capacity and low efficiency for the cost and surface area. 1 kg, that is, 1 liter of water, up 20 meters, is only 200 joules. An app

Pumped storage is quite low capacity and low efficiency for the cost and surface area. 1 kg, that is, 1 liter of water, up 20 meters, is only 200 joules. An apple laptop uses 40 watts: which is that amount every five seconds.

dhimes 18y ago
actually, 2 meters gives you 20 joules...but your point is still valid
- DaniFong 18y ago
  Whoops. g ~= 10. Always I forget...