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The effect of water salinity on electrolysisFeatured science projectScience project video


The results show that the bulb will light up when sea water is used but does not light up when distilled water is used. The current measured was also higher for sea water. However the voltage measured was almost the same for both electrolyte solutions.

Electrolyte Solution

Voltmeter (V)

Ammeter (A)

Light bulb

Distilled water



Not lighted

Sea water



Lighted up

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Complexity level:
Project cost ($):
Time required:
1 hour to prepare, 1 hour for experiment
Material availability:
May be purchased from a hobby store, or alternatively obtained from a school science laboratory
Safety concerns:

1. Use only batteries. NEVER connect to a mains supply.
2. Conduct the experiment under supervision of a qualified person (science teacher). Flammable gasses may be released.
3. Electrolysis of sea water may produce chlorine gas. Take necessary precaution. Ensure that the experiment is conducted in a well-ventilated laboratory