Why analog out of interest?

Digital might be a better place to start these days with all of the cheap components you can buy and some of the fun things you can build with digital electronics? Not my kid, but I brought a kid in my family a pack of cheap components and we built things together based on his interest and creativity.

I'd probably just buy a pack of components and build stuff with them like a lego set. Anything you build will present an opportunity to talk concepts like voltage, current, etc. I guess if they're nine you might be able to cover some of the basic math too.

I originally learned with an old Radio Shack electronics kit like this one:

https://old.reddit.com/r/electronics/comments/g6vyjc/old_ele...

I tried to get my kids interested with the modern equivalent, Snap Circuits, but they didn't take to it. It was too limited and toy-like.

I later acquired an old electronics kit like the above, and they were much more interested in that. You can still find the older kits on eBay for not too much money.

Keep in mind they may not take to it like you did. My kids' own interests went to more mechanical stuff and small gasoline engines and electric motors instead.

Don't steer their interests, feed them. Provide breadcrumbs for their curiosities.

I don't have any kids but if I ever do, I'd get them one of those spring and wire based 30 In 1/etc kits. That's how I fell in love with electronics.

haven’t done it, but I’d try a rain sensor. and if the child is into music, a guitar tone knob.