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century 21 technology/batteries

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Make a Rheostat

This article provides steps for making a rheostat, a small device that controls the voltage by a dial or knob. Great for science fairs!

Electrolysis of Water Experiment

In this free science fair project idea, kids will conduct an easy electrolysis of water experiment to test solutions of salt, baking soda, tap water, and more.

Battery Power

This science fair project idea determines the operating differences of AAA, AA, C, D batteries all with a 1.5 volt rating.

Complete Circuit: How Does a Flashlight Work?

How does a flashlight work? Kids will make a complete circuit and explore how voltage contributes to brightness with this science fair project idea.

Protectors: How do Fuses Protect Wires From Overheating?

How can fuses protect electric wires from overheating? In this free science fair project, you can explore and learn how fuses protect wires from heating up.

Series Circuit

In this science fair project, you will use a model to demonstrate a series circuit and determine how to measure the voltage, current and resistance.

Which Battery Lasts the Longest?

Which battery lasts the longest? In this science fair project, kids will test popular brand name batteries like Duracell and Energizer against generic brands.

Series and Parallel Circuits

How do series and parallel circuits work, and which produces the brightest light in a light bulb? Construct both in this project and find out!

Static Electricity Project

The goal of this science fair project is to demonstrate different ways to generate static electricity and record its effects.

Does Electricity Move Better through Thick Wires or Thin Ones?

Does electricity move better through thick wires or thin ones? kids will conduct this classic electricity experiment for this science fair project.

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