ELI5 Defibrillators - why AEDs at malls differ from those on TV?

What exactly is a defibrillator? Why is the analogy of jump starting a car incorrect? What’s happening in the heart when a shock is delivered? What is the AED and how do you spot one in public? What happens when you activate an AED? Who invented it? ... we explain like I'm five Thank you to the r/explainlikeimfive community and in particular the following users whose questions and comments formed the basis of this discussion: yllibjkrauss, only_sometimes_haiku,letsdothisepic, marmorset, smileylinzi and count2zero To the community that has supported us so far, thanks for all your feedback and comments. Join us on Twitter: https://www.twitter.com/eli5ThePodcast/ or send us an e-mail: [email protected]