der Mouse wrote:
   My Dad's
got 10000uF capacitors for his audio amps, and they're the
 size of a coke can.  I reckon 100 such capacitors would fit in my
 schoolbag, at worst..." 
 That's a big schoolbag.  I regularly carry five dozen 341-ml aluminum
 cans in my backpack (they're iced tea cans, not pop cans, but they're
 standard pop-can size), and it's a big backpack and they fill it right
 full up.  100 would be five-thirds as much, more like a sports
 equipment bag. 
 
That's about right.  I used to carry a lot of fairly random stuff about...
  And, of course, it depend heavily on the working
voltage.  a 1Fd 5V cap
 is generally smaller than a 1Fd 50V cap.  (And, now that supercaps have
 shown up, low-voltage caps have gotten even smaller.)
  And that's how I learned that school
wasn't going to teach me
 anything useful, or basically true. 
 Well, you'd already learned to sanity-check claims you hear, which is
 arguably a more valuable lesson. :-) 
Now *that* is true...
Gordon