Earthquake Earthquake Alarm is a normal natural geological movement, but a great deal of harm to human beings, and sometimes it happens very suddenly, in order to measure earthquakes, geologists have used a variety of instruments, which is a common seismograph one kind, but in the end the earthquake alarm device is based on what work? By the following experiment let us go to explore the mystery of it! Experimental purposes: 1. to understand the phenomenon of understanding earthquake earthquake alarm works. 2. Students learn the courage to explore consciousness and self-help earthquake cognitive ability test: the earthquake, also known as earth, ground vibration, rapid release of energy is the earth's crust caused by the process will produce a natural phenomenon seismic vibration periods. Earthquake alarm: mainly in the earthquake, before the arrival of a strong destructive seismic waves, serve as a reminder and a warning in advance, so that people can fight to survive the time. Experimental procedure: 1. Experimental preparation: understanding experimental equipment: double-sided tape, buzzer, plastic tube, color paste, battery boxes, plastic boxes, thin copper wire conductors, a small base, glass balls, light-emitting diodes, with copper wire pole piece. 2. The copper intermediate position with a pole piece according to the requirements shown in Figure 1 is bent at 90 degrees, the wire penetrates the plastic tube, leaving one end of the length of an appropriate amount; pole pieces and then inserted into a plastic tube with a copper wire (pole piece and consistent with the bent wire inserted a long plastic tube angle direction, a pole piece with copper wire bent angle perpendicular to the direction of the short plastic tube inserted) and stay out of the wire and the pole piece (or wire) connection (in addition to a plastic pipe The same operation) 3. Step 2 well in the two-band line pipe, insert a small fixed base, respectively, to wear a piece of double-sided adhesive foam and plastic boxes adhesively fixed at both ends of the box. The buzzer and diode wires through the middle of double-sided tape and plastic boxes of the hole in the plastic box paste. 4. circuit connection: Reference circuit diagram (1), the plastic box above means deemed switches, students in electrical circuit diagram marked with (light-emitting diode, buzzer) positive and negative. Then, the control circuit of Figure 1 is connected (light-emitting diode, the buzzer is connected, the red line is positive) circuit connected after, battery, attached with double-sided adhesive fixing, replacing the cover. 5. After the thin copper wire tie through the hole in the glass sphere on the lower pole piece can adjust the height of the wrapped around the top of the pole piece, adjusting the wire in the rest of the time is right in the middle of the lower pole piece hole position, which When the buzzer and light-emitting diodes do not work. Appear like a rock, copper sheet Unicom put poles, electrical appliances on the police. Tip: buzzer, light-emitting diodes are positive and negative points of the positive (red line) is a must and the positive power supply is connected, otherwise they would not work. Knowledge Development: Earthquake Alarm principle: the use of closed circuit principle, complete sound, light, electricity is one of the electronic small production "Earthquake Alarm." When the ball hanging in the air by the shock that will hit the upper end of the copper ring, followed by light-emitting diodes stop flashing, the speaker of the music played, and thus play a role in the use of the pituitary alarm pendulum dynamics and physics of sound and light electromagnetic movement principle. When the seismograph to vibration, pituitary wobble and led indirectly overhanging bare closed circuit system is not turned on, the buzzer and the diode will work simultaneously issue a "beep, beep" alarm sound and flashing red warning appears, Escaping a reminder that early shock. You know what? Earthquake Survival Manual: First, to calm, to be squat or sit down and choose a good place to escape, face down, his forehead on the pillow in his arms; or caught around the legs and other solid objects, so as not to shock when you fall or because of physical runaway shift injured; protect the head and neck, bow, hand cover your head or neck; protect the eyes, looking down, eyes closed, to prevent foreign object damage; when protecting the mouth, nose and there may be used a wet towel over his mouth nose, to prevent dust, gas. Specific reference "Earthquake Survival Handbook" experiment: This product is to exercise the child's mental and physical ability to help children understand the pituitary swing dynamics and physics of sound and light circuit theory, and not as an earthquake alarm professional use! Conditional children can learn professional earthquake alarm is what the network and books. http://www.bjxwt.com Beijing precedent http://www.bjxwt.com.cn Beijing Education Development Co., Ltd. stationery small child playing precedent http://www.xianhe-edu.com Beijing Education Development Co. Company Stationery Factory