This experience is called three zinc-copper batteries. 
light a LED 
We can see how chemical energy 
that is stored in the 
solution components 
of the acetic acid (vinegar) can light a LED.
A current can flow through the wires
due to a spontaneous redox reaction 
Three pairs of plates zinc-cupper are connected electrically,
each battery is connected in series with each other
closing circuit with a LED.
The LED then light on.
In each battery, zinc is oxidated leaving electrons on zinc plate. 
The electrons are absorbed by protons in the acid solution producing hydrogen.
Thus, the redox reaction produces the hydrogen gas 
bubbling, as can be seen
in the surface of the zinc plate. 
The electrons produced on the zinc pass to cupper plate producing an electrical current.
This process occurs also in the alkaline batteries, 
although the components are others.
The LED lighting is observed.
