How do speakers turn signals into sound?

Question: How do speakers turn signals into sound?
- Keywords:
  signals,
  sound,
  speakers
Asked by Ioan cruyf to Duncan on 13 Nov 2017.
- Duncan McNicholl answered on 13 Nov 2017:
  
  With magnets. There’s a coil of wire in a speaker, and when electricity passes through it it turns into a magnet, just like the ones they use to pick up cars in a scrapyard. The magnet pulls another magnet towards it or pushes it away, depending on which way the electricity is going, and then the second magnet is attached to a big paper cone so that it pushes and pulls a big chunk of air along for the ride. Since sound is just chunks of air moving around, that’s the whole thing working now.

Question: How do speakers turn signals into sound?