Batería de Limón

Construcción de una celda galvánica simple a partir de cítricos

Electrochemistry Beginner (Middle School) 20 min ~$5,00

Objetivo

Construir una celda galvánica simple usando un limón, una moneda de cobre y un clavo de zinc para demostrar cómo la energía química se convierte en energía eléctrica.

Antecedentes

A lemon battery uses the citric acid in lemon juice as an electrolyte. The zinc nail acts as the anode (oxidation) and the copper coin as the cathode (reduction). The potential difference between zinc and copper drives electron flow through an external circuit.

Advertencias de seguridad

  • Do not eat the lemons after the experiment — they contain metal residues
  • Handle sharp nails with care

EPP requerido

goggles

Materiales

  • Fresh lemons (3)
    Large and juicy
  • Copper coins or strips (3)
    Clean pennies or Cu strips
  • Zinc-coated nails (3)
    Galvanized nails
  • Insulated copper wire (1 m)
    With alligator clips
  • LED light (1)
    Low-voltage red LED

Equipamiento

Multimeter Wire strippers Alligator clips

Procedimiento

1

Roll each lemon on a flat surface while pressing gently to break the internal membranes and release juice.

2 min
2

Insert a copper coin or strip into one side of each lemon and a zinc nail into the other side. Keep the metals about 3 cm apart.

3 min Handle nails carefully
3

Use the multimeter to measure the voltage across a single lemon cell (between the copper and zinc). Record the voltage.

2 min
4

Connect three lemons in series: zinc of lemon 1 to copper of lemon 2, zinc of lemon 2 to copper of lemon 3.

5 min
5

Measure the total voltage of the three cells in series.

2 min
6

Connect the LED to the free copper and zinc terminals. Observe if it lights up.

3 min
7

Record observations about brightness and voltage over time.

3 min

Resultados esperados

Each lemon cell should produce approximately 0.9-1.0 V. Three in series should give about 2.7-3.0 V, enough to dimly light a red LED. The voltage will slowly decrease over time as the zinc is consumed.

Limpieza

Remove all metal pieces from the lemons. Dispose of the lemons in the trash (not compost). Wipe down the metal pieces for reuse.

Detalles

Categoría
Electrochemistry
Dificultad
Beginner (Middle School)
Duración
20 min
Costo estimado
$5,00
Pasos
7
Materiales
5

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Frequently Asked Questions

What is the objective of Batería de Limón?
Construir una celda galvánica simple usando un limón, una moneda de cobre y un clavo de zinc para demostrar cómo la energía química se convierte en energía eléctrica.
How difficult is Batería de Limón?
This experiment is rated as Beginner (Middle School). It takes approximately 20 minutes to complete.
What safety precautions are needed for Batería de Limón?
Key safety precautions include: Do not eat the lemons after the experiment — they contain metal residues; Handle sharp nails with care.
What materials are needed for Batería de Limón?
The main materials required are: Fresh lemons, Copper coins or strips, Zinc-coated nails, Insulated copper wire, LED light.
What results should I expect from Batería de Limón?
Each lemon cell should produce approximately 0.9-1.0 V. Three in series should give about 2.7-3.0 V, enough to dimly light a red LED. The voltage will slowly decrease over time as the zinc is consumed.