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The Alchemist Experience
Galvanic Cell with LED — Power a Light with Chemistry
Galvanic Cell with LED — Power a Light with Chemistry
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No batteries. No outlets. No external power source of any kind. Just two metal electrodes, two electrolyte solutions, a homemade salt bridge made from a strip of paper towel and a glowing LED that you powered with a spontaneous chemical reaction. This is the Daniell cell, invented in 1836 and the direct ancestor of every battery ever made. Build it from scratch, watch zinc slowly dissolve at one electrode while copper atoms deposit at the other, connect two cells in series to make the LED shine brighter. This is exactly the same way a 9V battery packs six cells together to hit its target voltage. The chemistry is happening at the atomic level and the glowing light is your proof. If you've ever wondered how a battery actually works, not just that it stores energy, but what is physically happening inside, this is the experiment that answers that question in the most direct way possible.
What's Included
- Zinc electrode strip (~5cm)
- Copper electrode strip (~5cm)
- Zinc sulfate solution 0.5M 50mL
- Copper sulfate solution 0.5M 50mL
- Sodium chloride 5g — salt bridge electrolyte
- Red LED × 2 (1.8–2.2V forward voltage)
- Alligator clip leads × 4
- Small beakers × 2
- Fine sand paper
- Nitrile gloves × 2 pairs
- Safety goggles × 2 pairs
- Printed worksheet with voltage calculations
You Provide
- Paper towels
- Multimeter - not necessary, but helps to quantify battery voltage
- Waste containers - old jars or bottles for waste disposal
Curriculum Connections
- NGSS HS-PS1-2 / HS-PS3-2/3 — Chemical to electrical energy conversion
- NGSS HS-ETS1-2 — Engineering a multi-cell series circuit
- AP Chemistry Unit 9 — E°cell, ΔG° = −nFE°, galvanic vs electrolytic cells
- IB Chemistry Topics 9 & 19 — Redox, standard electrode potentials, electrochemistry HL
- Real-world: battery technology, electric vehicles, portable electronics, energy storage
♻ Waste Disposal
Rating: Medium
Copper sulfate and zinc sulfate solutions are toxic to aquatic life. Collect in labeled waste containers, do not drain. Salt bridge solution is non-hazardous and can be drained. Electrodes are reusable.