Bateria de Limão

Construção de uma célula galvânica simples a partir de frutas cítricas

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

Objetivo

Construir uma célula galvânica simples usando um limão, uma moeda de cobre e um prego de zinco para demonstrar como a energia química se converte em energia elétrica.

Contexto

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.

Avisos de segurança

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

EPI necessário

goggles

Materiais

  • 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

Equipamentos

Multimeter Wire strippers Alligator clips

Procedimento

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.

Limpeza

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

Detalhes

Categoria
Electrochemistry
Dificuldade
Beginner (Middle School)
Duração
20 min
Custo estimado
$5,00
Passos
7
Materiais
5

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Frequently Asked Questions

What is the objective of Bateria de Limão?
Construir uma célula galvânica simples usando um limão, uma moeda de cobre e um prego de zinco para demonstrar como a energia química se converte em energia elétrica.
How difficult is Bateria de Limão?
This experiment is rated as Beginner (Middle School). It takes approximately 20 minutes to complete.
What safety precautions are needed for Bateria de Limão?
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 Bateria de Limão?
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 Bateria de Limão?
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.