I find adding a crank to anything quaint and hilarious. Even if just photoshoppedtm

A steam whistle that required a good crank and verifying subscrrription overrr dialup would end me

Edit: it must be a crank and it has to play the all around the blueberry bush progress song like the Sid’s handy jack in the box in Toy Story 1

  • tal@lemmy.todayEnglish
    4·
    27 days ago

    Can a human even make enough energy when cycling to power a PC?

    How do you define a “PC”?

    A CR2032 button cell will run a wristwatch for maybe two years. It looks like a CR2032 stores maybe 730 mWh.

    https://sustainability.stackexchange.com/questions/4391/how-much-power-can-a-bicycle-generator-produce

    BBC1’s “Bang Goes the Theory” demonstrated a human-powered home in a TK programme. In this segment, 8.5 kW of power required 70 cyclists, of fairly typical fitness, or about 107W per cyclist.

    So, if you include a wristwatch, then clearly yes. Someone doing 107W for an hour would produce 107Wh. That’d be about 146 fresh CR2032 button cells, each of which could run that wristwatch for maybe two years.

    If you count a wristwatch as a personal computer, then clearly it’s possible and even practical.

    If you want my Linux laptop at its current power draw…

    unplugs laptop

    $ cat /sys/class/power_supply/BAT0/voltage_now 
16920000
$ cat /sys/class/power_supply/BAT0/current_now 
-783000
$

    That’s 16,920,000 µV, or 16.92V and -783000 µA, or 0.783A. 16.92 volts times 0.783 amps gives about ~13.2W.

    So a cyclist could power it, at least at its present draw. But that’s also at a fairly idle state, and I don’t have the screen brightness really ramped up.

    An easy way to do the above in short form on a Linux laptop would be this:

    $ echo "$(cat /sys/class/power_supply/BAT0/voltage_now) * \
  $(cat /sys/class/power_supply/BAT0/current_now) / 10^12" | bc

    Could a single cyclist power my desktop under load? No. The GPU alone has a TDP of 355W.