So sometime past the... The erm... [ He taps his head and mumbles. ] When did those get patented again... Well, I think I'm from the 1800's or so, and I'm pretty sure flushable toilets were available to the middle class by then.

[ ... He shakes his head. ] ANYWAY, an electric circuit is the complete path of an electric current. See, the current would travel from this lightning rod, through the wires, and into this box...

[ He's going to explain his process as he goes back to his work until Mabel gets tired of listening to this nerd ramble on about electric wiring. ]