Voltage can be produced in many ways. In an electric generator, it is produced by varying the magnetic flux through loops of wire as the loops rotate. Mechanical power is needed to turn the coils in the magnetic field.
Voltage can also be produced by moving charge by means of friction (static electricity) or chemical reaction (betteries and fuel cells)
What three things are required to produce voltage? These three things are the fundamentals of how an electrical generator works.
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