One loop, one break, everything stops
Two lamps are on one loop. Both glow. Remove one, and the other goes dark too.
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The idea
Step 1 of 3
- Two lamps, a switch and a wire, all on one loop. Both lamps light.
- The first lamp is taken out. There is one gap now.
- Both lamps go dark, not just the one that was removed.
The rule
Parts in one loop share one path. Take one out and every lamp goes dark.
A broken filament leaves a gap, like a lamp taken out.
Parts joined one after another are in a row.