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WHO'S THERE?

Build your own intruder detector in this simple experiment

Suitable For

Grade 6

Difficulty

3

Time Required

 <2 Days

Supervision

Advised

What’s it about?

In this science experiment we will be learning more about electrical current, and how electrical circuits are useful to us in our everyday lives. Many electrical devices are used in the security business these days, for example burglar alarms, electric fencing, access control systems and many more. In the following science experiment we will build a device that can detect intruders in front of your room:

Topics covered

Electrical current, Buzzer

What will I need?

  • INSULATED COPPER WIRE
  • 9-VOLT BATTERY
  • 9-VOLT BUZZER
  • CORRUGATED CARDBOARD
  • STICKY TAPE
  • ALUMINIUM FOIL

Procedure (Method)

Unfortunately, this section is only available in the e-book version of the project.

How does it work?

Unfortunately, this section is only available in the e-book version of the project.

The power or ‘electrical energy’ stored in a battery can only be released and allowed to flow when a complete circuit is made out of wires or other ‘conductors’ that conduct electricity. In the above experiment, when someone steps on the mat pressing the two aluminium pieces ‘conductors’ together, a complete circuit is made from the positive (+) terminal of the battery to the negative (-) terminal of the battery. The current flows from the battery through the ‘detector’ under the mat and the buzzer in your room. When the circuit is complete and the current is flowing, the buzzer sounds to warn you of a possible ‘intruder’.

Like the sound of it?

Why not check out the full worksheet in one of our popular e-books?

This particular science project can be found in any of the following Experiland e-books:

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