柠檬电池

用柑橘类水果制作简单原电池

Electrochemistry Beginner (Middle School) 20 分钟 ~$5.00

目标

用柠檬、铜硬币和锌钉构建简单原电池，演示化学能转化为电能的过程。

背景

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.

安全警告

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

所需PPE

goggles

材料

  • 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

设备

Multimeter Wire strippers Alligator clips

步骤

1

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

2 分钟
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 分钟 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 分钟
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 分钟
5

Measure the total voltage of the three cells in series.

2 分钟
6

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

3 分钟
7

Record observations about brightness and voltage over time.

3 分钟

预期结果

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.

清理

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

详情

类别
Electrochemistry
难度
Beginner (Middle School)
时长
20 分钟
预估费用
$5.00
步骤数
7
材料
5

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Frequently Asked Questions

What is the objective of 柠檬电池?
用柠檬、铜硬币和锌钉构建简单原电池，演示化学能转化为电能的过程。
How difficult is 柠檬电池?
This experiment is rated as Beginner (Middle School). It takes approximately 20 minutes to complete.
What safety precautions are needed for 柠檬电池?
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 柠檬电池?
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 柠檬电池?
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.