Voltaic Cell: Used to produce electrical energy from chemical energy
The electrodes are made from metals with different reactivity
Negative electrode: More reactive metal, ex. Zinc
Positive electrode: Less reactive metal, ex. Iron
Electrolyte is a strong acid, ex. sulfuric acid
The negative electrode loses electrons; these flow through the simple circuit to the positive electrode to produce voltage. This is measured on the attached voltmeter.
Note: The greater the difference in reactivity, the greater voltage produced