Electric bell. How electric bell works. Electromagnet pulls the clapper. The hammer strikes the gong. In its rest position the clapper is held away from the bell a short distance
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alarm alarms alert attention ball battery bell bells burglar called circuit clapper coil contacts crossings current danger diagram door doorbells education educational electric electrical electricity electromagnet electromagnetism emergency equipment field fire gong illustration iron loud magnet magnetic metal old physics pole pulling railroad ring safety school science scientific security shape sound spring steel switch telephones urgency urgent
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