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Meet the Engineers How to Make a Burglar Alarm During a visit to Sleepy Hollow Middle School in Westchester County, New York, Nick showed seventh- and eighth-graders how to make their own burglar alarms. You can try it too! Equipment: Method: How it works: Some ideas to try: Electrical engineers keep track
of three quantities when they design circuits: Voltage is electrical pressure or
force. Symbolized by "V", it is measure in volts. Current is the flow of
electrons passing a given point. Symbolized by the letter "l," it is measured in
amperes. Power is the work performed by a current. Symbolized by the letter "P,"
it is measured in watts. We generate voltage by using batteries,
generators and solar cells. We get current by placing voltages across things such as
buzzers, lights, resistors and other interesting devices. Using voltage to make things
happen is the purpose of electronics. Ohms Law is the relationship between
voltage, current, resistance and power. |
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National Engineers Week Foundation
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