Pin Chanh

Chế tạo pin galvanic đơn giản từ quả cam chanh

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

Mục tiêu

Chế tạo pin galvanic đơn giản dùng quả chanh, đồng xu đồng và đinh kẽm để minh họa cách năng lượng hóa học chuyển đổi thành năng lượng điện.

Bối cảnh

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.

Cảnh báo an toàn

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

PPE cần thiết

goggles

Vật liệu

  • 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

Thiết bị

Multimeter Wire strippers Alligator clips

Quy trình

1

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

2 phút
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 phút 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 phút
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 phút
5

Measure the total voltage of the three cells in series.

2 phút
6

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

3 phút
7

Record observations about brightness and voltage over time.

3 phút

Kết quả dự kiến

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.

Dọn dẹp

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

Chi tiết

Danh mục
Electrochemistry
Độ khó
Beginner (Middle School)
Thời gian
20 phút
Chi phí ước tính
$5,00
Số bước
7
Vật liệu
5

Thí nghiệm khác

Các Phương Pháp Chống Rỉ Sét 30 min Chế Tạo Pin Daniell 45 min Điện Phân Đồng Sunfat 50 min Điện Phân Nước 40 min Đo Điện Thế Pin Voltaic 60 min Kiểm Tra Dãy Hoạt Động Hóa Học 30 min Mạ Điện Đồng 60 min Pin Nồng Độ 45 min

Frequently Asked Questions

What is the objective of Pin Chanh?
Chế tạo pin galvanic đơn giản dùng quả chanh, đồng xu đồng và đinh kẽm để minh họa cách năng lượng hóa học chuyển đổi thành năng lượng điện.
How difficult is Pin Chanh?
This experiment is rated as Beginner (Middle School). It takes approximately 20 minutes to complete.
What safety precautions are needed for Pin Chanh?
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 Pin Chanh?
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 Pin Chanh?
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.