What IS magnetism, anyway? You can feel how two magnets can push against each other when you bring them close together, but what IS that invisible force, and why is it there? And how come magnets stick to the fridge and not a soda can, even though both are metal?
And if you’ve ever slid magnets down a metal ramp, you’ve seen them defy gravity and slow to a stop. And how come the grapes from your lunchbox twist around to align with magnets, even though there’s no iron inside? Does it sound like fun to figure this stuff out? That’s exactly what we’re going to do together now.
Alexander Graham Bell developed the telegraph, microphone, and telephone back in the late 1800s. We’ll be talking about electromagnetism as we cover the basics using his ideas so you can understand how loudspeakers transform an electrical signal into sound.
Go here for Aurora's online school: www.SuperchargedScience.com/school