power bulb with lemon

comparing lemon or battery to light up a light bulb.
Mohammed Hussain Farhat
Grade 5


I believe both ideas will light the bulb. Lemons are acidic and that can produce electricity. Batteries can also power anything because they are acidic.



The following sites helped me build my Lemon Explosion Circuit:

The following site helped me in my understanding in building my Battery Volcano Circuit:

  • https://learning-center.homesciencetools.com/article/circuit-science-projects-for-elementary/


Controlled Variables:

Switch; because it controls the light bulb turning on or off

Conductors; Without the conductors you cant produce any electricity because the electrons have no where to go

•The light bulb; without it we don’t have anything to light and we can have a short circuit

Manipulated Variables:

•In this circuit the only manipulated variable is the battery which can be changed with the lemons

Responding Variables:

Lighting up of the Bulb


The procedure for the Battery Volcano and the LemonExplosion had  three seperate trials involved. This was to determine accuracy and consistency in the results.

Battery Volcano

  1. Attach one side of the alligator clip onto the negative side of the 9V battery, then attach the other end of the wire to the switch
  2. Attach another alligator clip onto the other side of the switch and then attach the other end of the alligator clip onto the negative end the diode light
  3. Attach a new alligator clip to the positive end of the diode light and connect the other end to the positive side of the 9 V battery

Lemon Explosion

  1. Take 4 Lemons and roll them to release some acidity
  2. Then put one galvanized screw wrapped with copper wire into one lemon and then insert the remaining copper wire into the next lemon. Repeat this process for the next two lemons
  3. Now take the fourth lemon and insert a galvanized screw with no copper wire wrapped around it. Attach an alligator clip to the screw and attach the other end of the alligator clip to the switch
  4. Take another alligator clip and attach it to the other side of the switch and connect it to the negative (black) end of the diode light.
  5. Take the last alligator clip and attach it to the positive end (red) of the diode light and connect the other end of the alligator clip to a piece of copper  inserted into the lemon


Both lights were able to light up in my experiments. The Lemon Explosion appears to be dimmer than my Battery Volcano circuit.


The light bulb in the battery circuit was brighter than the light bulb in the lemon circuit. This was because the acid in the battery was stronger than the acid in the four lemons.


The 9V Battery worked as a better source to light the bulb for a long period of time. The lemon also worked but it was fairly dim compared to the battery source. This was mainly because the four lemons combined produce less than 4V total and the acid in the lemons was exposed to air hence created oxidization. Overall, my experiment was successful and my hypothesis was proven correct. 


This experiment helped me learn that we can use different sources of energy that are friendly to our environment, knowing how fossil fuels are currently a main source of energy. In the future maybe we can use compost of fruits in large quantities to power certain projects. 

Sources Of Error

  • Acidity of lemons when exposed to air will oxidize and this could have affected results. 
  • The purity of the copper conductor used for the lemons
  • poor quality LED bulb


The following website was a source that helped me determine that about less than 4V was used in total using four lemons:


The following sites helped me build my procedures, materials, conclusion and results  for my Battery Explosion Circuit and Lemon Explosion Circuit:





My mom.My dad and my Aunt Alya Heirali that has dedicated her life to science and completed her post doc, she has always inspired me to explore, be curious and experiment!