Answer:
True
Step-by-step explanation:
As the question state a voltage generator in a circuit is any element that creates a positive (according to the point of view/measure) difference in a electric potential, allowing to start a current flow in a close path circuit.
A battery creates a electric potential through a chemical reaction that makes the electrons internally to "split" at sides of the battery, generating a different charge level at each side.
A generator by the Faraday Law, creates a magnetic field that "organize" the charges to create an associated electric potential or voltage.