A lemon battery is made up of two metallic electrodes comprising of two different metals. Lemon battery is just a small experiment which shows how batteries work. Although the lemon battery is not strong enough to make a light bulb work, however it is strong enough to power up a LED (Light Emitting Diode).
The lemon battery is also a very common experiment which is projected in many science textbooks around the world.
To make a lemon battery you need two different metallic objects, most commonly used objects are a Galvanized Nail, a Copper Coin and a juicy lemon. Although potatoes and apples can be used, but lemon is preferred as it has more acidic value.
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The lemon used in the experiment should be disposed of immediately as it becomes poisonous because of the dissolved copper salts.