بطارية الليمون

بناء خلية جلفانية بسيطة من فاكهة الحمضيات

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

الهدف

بناء خلية جلفانية بسيطة باستخدام الليمون وعملة نحاسية ومسمار زنك لإظهار كيفية تحويل الطاقة الكيميائية إلى طاقة كهربائية.

الخلفية

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.

تحذيرات السلامة

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

معدات الوقاية الشخصية المطلوبة

goggles

المواد

  • 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

المعدات

Multimeter Wire strippers Alligator clips

الإجراء

1

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

2 دقيقة
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 دقيقة 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 دقيقة
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 دقيقة
5

Measure the total voltage of the three cells in series.

2 دقيقة
6

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

3 دقيقة
7

Record observations about brightness and voltage over time.

3 دقيقة

النتائج المتوقعة

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.

التنظيف

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

Frequently Asked Questions

What is the objective of بطارية الليمون?
بناء خلية جلفانية بسيطة باستخدام الليمون وعملة نحاسية ومسمار زنك لإظهار كيفية تحويل الطاقة الكيميائية إلى طاقة كهربائية.
How difficult is بطارية الليمون?
This experiment is rated as Beginner (Middle School). It takes approximately 20 minutes to complete.
What safety precautions are needed for بطارية الليمون?
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 بطارية الليمون?
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 بطارية الليمون?
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.