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5E40.25 - Lemon Battery

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​5E40.25 - Lemon Battery

Title5E40.25 - Lemon Battery

Demonstrate electromotive force using a lemon and electrodes of dissimilar metal.

Assembly Instructions

A lemon is slightly smushed to release some of the juices (not enough to split the fruit).  An aluminum and a copper electrode are stabbed into the slightly smushed lemon, make sure they do not touch each other.  Connect the electrodes to a multimeter through banana cables.  The voltage between the two electrodes can then be measured by the voltmeter set on VDC.  Use a camera to image the output of the multimeter for the audience.

**This demonstration must be requested at least 24 hours in advance.**


Setup Time5
Operation Time5
Preview Time5
Operation Instructions

​Make sure the camera output is visible to the audience.  One electrode should already be in the lemon.  Stab the lemon with the second electrode, make sure the two electrodes do not touch each other.  The multimeter should read slightly less that 1-V when both electrodes are in the lemon. 

**This demonstration must be requested at least 24 hours in advance**

Demo on DimeNo
PIRA 200Yes
Export Instructions (if different)

​The internal chemical reaction within the "battery" between the electrolyte (citric acid) and the negative metal electrode produces a build up of free electrons called the anode.  The chemical reaction between the electrolyte and the positive metal electrode produces an excess of positive ions at the cathode.  The electrical pressure or potential difference between the positive and negative terminals is called voltage or electromotive force.

Category5 Electricity and Magnetism
Subcategory5E - Electromotive Force and Current
KeywordsEMF, electrolite, electrolyte
Construction Information
lemon (or other citrus fruit or apples)
aluminum and copper electrodes
multimeter - voltage DC
banana cable
camera - b&w