Electricity
is a form of energy. A law of energy, Conservation of Energy, says that energy cannot be created or destroyed. However, energy can be converted from one form to another.
Some of the most common energy sources are:
chemical
mechanical
heat
light
Chemical
Some examples of chemical energy being converted to electrical energy are:
lead acid battery (car battery)
carbon zinc battery (D cell)
electrolyte with dissimilar metal
Mechanical
Some examples of mechanical energy being converted to electrical energy are:
friction
piezoelectric crystal
magnetism (moving conductor in a magnetic field such as an alternator)
Heat
An example of heat being converted to electrical energy is:
thermocouple
Light
An example of light being converted to electrical energy is:
solar panel
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