Tim Hunkin had a wonderful series on TV back in the 80s or 90s - the Secret Life of Machines. Nice relaxed pace and great for kids. The episodes are up on YouTube via his website: https://timhunkin.com/a243_Secret-Life-of-Machines-intro.htm

The videos of each "arcade" are quite entertaining:

https://novelty-automation.com/10_current-machines.htm