- Twelve amps?
- You can't run a vacuum cleaner on 12 amps, John.

6 seconds sound clip from the Apollo 13 movie soundboard.

You can hear this line at 01:15:51 in the Blu-ray version of the movie.

Quote context

[...]

- Power is everything. Without it, they don't talk to us, they don't correct their trajectory and they don't turn the heat shield around.

- We gotta turn everything off. Now.

- They're not gonna make it to re-entry.

- What do you mean, everything?

- If everything's on, the LEM draws 60 amps. At that rate, in 16 hours the batteries are dead, not 45. And so is the crew. We gotta get them down to 12 amps.

- Twelve amps?

- You can't run a vacuum cleaner on 12 amps, John.

- We gotta turn off the radars, cabin heater instrument displays, guidance computer, the whole smash.

- Guidance computer? What if they need to do another burn? They won't know which way they're pointed.

- The more time we talk down here, the more juice they waste up there. I've been looking at the data for the past hour.

- That's the deal?

- That's the deal.

[...]