How Doorbells Work
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When you push a doorbell (orange button), an electric circuit is completed (gray rectangle) that powers an electromagnet, which makes a striker hit a bell.
Contributed by: Enrique Zeleny (April 2012)
Open content licensed under CC BY-NC-SA
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"How Doorbells Work"
http://demonstrations.wolfram.com/HowDoorbellsWork/
Wolfram Demonstrations Project
Published: April 6 2012