How many AA batteries does it take to watch a 2-hour movie on a projector?
About 180 AA batteriesA home projector draws about 270 W, and one AA holds about 3 Wh.
It takes about 180 AA batteries.
How we worked it out
A home projector draws about 270 W, and one AA holds about 3 Wh. Alkaline AA batteries, about 3 Wh each, and no energy lost on the way. Real life adds a little friction and waste, so treat the number as a solid ballpark rather than a lab result. The constants behind every experiment are on the science page.
Watch it happen
This was one of the five experiments in It Took #33. In the game you guess first, then the experiment plays out with your number: too few and it fails, too many and it overshoots.
Play It Took #33Play today’s experiments
More aa batteries questions
- How many AA batteries does it take to watch 3 hours of TV? About 100.
- How many AA batteries does it take to iron clothes for 30 minutes? About 170.
- How many AA batteries does it take to charge an electric scooter? About 180.
- How many AA batteries does it take to air-fry for 20 minutes? About 190.
- How many AA batteries does it take to charge an e-bike battery? About 210.
- How many AA batteries does it take to run the dishwasher once? About 300.
- How many AA batteries does it take to run a fan all night? About 310.
- How many AA batteries does it take to take an 8-minute electric shower? About 330.