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        5-8

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        SciGirls | Keep Out!

        Experiment with circuits in the SciGirls activity that leads students through the construction of a doormat alarm. Most alarm systems are nothing more than a sensor or two connected to a siren or buzzer. Simple alarms consist of a sensor that doubles as a switch. When activated, the sensor completes an electric circuit and electricity flows to the siren, sounding the alarm!

        Visit pbskids.org/scigirls for more videos and projects.

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