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Electricity Science Fair Project

Electrolysis and Voltage

Electrolysis and Voltage | Science Fair Projects | STEM Projects
Let's explore the effects of increasing voltage on electrolysis. We'll use a beaker, tap water, salt, batteries, and more to observe the rate of release of hydrogen gas.


The hypothesis is that increasing the DC voltage applied to an electrolyte solution will increase the rate of release of hydrogen gas.

Method & Materials

You will need to strip the insulation of two copper wires, fill a beaker with water and salt, draw a line on two test tubes, and connect the battery terminals to the copper wires.
You will need a beaker, tap water, salt, four 1.5V batteries, a battery holder, two jumper wires, two test tubes, two PVC insulated copper wires, a stop watch, a pair of pliers, and a black color permanent marker pen.


Our hypothesis was proven to be true. Increasing the DC voltage applied to the electrolyte solution sped up the release of hydrogen gas. We observed that the time taken to collect the released hydrogen gas decreased as the voltage increased.

Why do this project?

This science project is interesting because it explores the effects of increasing voltage on electrolysis. It also shows how electrolysis can be used in industrial processes and measuring devices.

Also Consider

Experiment variations include varying the amount of salt in the water and using different types of electrolytes like vinegar or sulfuric acid.

Full project details

You can find additional information and details for this science fair project here. Have fun exploring!

Related videos

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