I have feedback about that activity. A kid was experimenting with batteries and light bulbs - they wouldn't turn on, though his wiring was correct.
After thinking about it and tinkering, it turned out there was a missing dependency - `gnucap`, simulation does not work without it. I didn't know it at the time and it was difficult to figure that out because we were in a remote village with sporadic 3G coverage and all those children were buzzing around with excitement (-:
Perhaps it is better to install it along with GCompris (the child-friendly approach) or turn it off (better, but inconsistent across computers) or show an error message (not child friendly at all).
Yes, that photo caught me while I was battling the problem (-: