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Make a light bulb shine using a lemon as a battery

Suitable For

Grades 3 & 4



Time Required

 <2 Days



What’s it about?

Batteries works because of the energy released by a chemical reaction which is then changed into electrical energy or ‘current’. Electrical current is caused by the movement of electrons through a complete circuit and can be used to light a flashlight, sound a bell, turn a motor and many other useful applications. In this science experiment we will learn more about batteries by making our own battery out of fruit to light a light bulb!

Topics covered

Electrical current, Volt, LED

What will I need?

  • NAIL
  • 0.2 VOLT LED

How does it work?

In the above experiment, in order for the electrons to flow, a source of energy is needed. This source of energy or ‘battery’ that we made comes from the two metal strips in the lemon. One of the metal strips has a tendency to lose electrons and the other to gain electrons. The copper strip serves as the positive electrode or cathode and the Zinc strip serves as the electron-producing negative electrode or anode. When two such metals are put in a chemical solution, such as the acid in a lemon, electrons will move from one metal to the other making an ‘electrical circuit’ and lights up the light bulb or LED!

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