单词	electric bell
释义	electric bell A device in which an electromagnetically operated hammer strikes a bell (see illustration). Pressing the bell-push closes a circuit, causing current to flow from a battery or mains step-down transformer through an electromagnet. The electromagnet attracts a piece of soft iron attached to the hammer, which strikes the bell and at the same time breaks the circuit. The hammer springs back into its original position again, closing the circuit and causing the magnet to attract the soft iron. This process continues until the bell-push is released. Electric bell
随便看	spiegel spin spin glass spin wave spin-orbit coupling spin-statistics theorem spinodal curve spinodal decomposition spiral galaxy spontaneous emission spring balance sputtering square wave squark stable equilibrium stainless steel standard cell standard deviation standard electrode standard electrode potential standard form standard model standard state standard temperature and pressure standing wave

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