Fruit battery

Batteries are comprised of two different metals suspended in an acidic solution. With the fruit-power battery, the two metals are zinc and copper. The zinc is in the galvanization of the nail, the copper is in copper-plated coins and the acid comes from the citric acid inside the lemon. The two metal components are electrodes, the parts of a battery where electrical current enters and leaves the battery. With a zinc and copper, the current will flow out of the coin and into the nail. The electricity also passes through the acidic solution inside the lemon. In the first video I used copper coins and iron nails to power the calculator. In the second video I used carbon rod and magnesium strip to power low voltage LED.

Volta discovered in 1800 that certain fluids would generate a continuous flow of electrical power when used as a conductor. This discovery led to the invention of the first voltaic cell, more commonly known as the battery. Volta discovered further that the voltage would increase when voltaic cells were stacked on top of each other.

Metals in a battery have different electrical effects. Volta noticed that the voltage potential with dissimilar substances got stronger the farther apart they were from one another. The number in the metals listed below is the affinity to attract electrons.
Magnesium = -2.38 Zinc = -0.76 Iron = -0.41 Copper = 0.34 Carbon = 0.4 Silver = 0.8 Cerium = 1.44