How could you use an electromagnet to make a burglar alarm? (Hint think about how
me fire doors work. You may want to draw a picture to help to explain how it works.)
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The current powers the relay's electromagnet, so the buzzer circuit stays open. When you move the magnet by opening the door, the spring snaps the switch back into the open position. This cuts off the current and closes the relay, sounding the alarm. You can also build this sort of system into a window.
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