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KNOCK, KNOCK

Make an electrical door bell for your room

Suitable For

Grade 3

Difficulty

2

Time Required

 <2 Days

Supervision

Advised

What’s it about?

In this science experiment we will study how electrical circuits are useful to us in our everyday lives. Many electrical devices works because of the fact that electrical energy can be converted into another type of energy that is useful to us. In the following science experiment we will build a electric door bell for your room:

Topics covered

Electrical current, Buzzer

What will I need?

  • 9-VOLT BATTERY
  • PLASTIC COATED COPPER WIRE
  • 9-VOLT BELL / BUZZER
  • CLOTHESPIN
  • WIRE PLIERS

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, the electrical circuit is not complete until the ends of the clothes pins with the wires wrapped around it are pinched together. When the clothespin is pinched, the wires touch, making a circular path between the battery and the bell. Electricity or ‘electrical current’ flows from the battery to the bell and back and the door bell sounds!

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