The concept of a generator that produces more energy than it consumes, commonly known as a perpetual motion machine or a free energy device, violates the fundamental laws of physics. According to the first and second laws of thermodynamics, also known as the laws of energy conservation and entropy, energy cannot be created from nothing, and in any energy conversion process, there will always be some energy loss.
In "Back to the Future," the flux capacitor is depicted as a device capable of generating "1.21 gigawatts of electricity" from the energy produced by a standard automotive fuel source. However, this is purely fictional and not based on any scientific principles.
While it's understandable that such concepts can be intriguing and appealing, scientists and engineers have not discovered a way to circumvent the laws of thermodynamics. These laws are well-established and have been extensively tested and confirmed through various experiments and observations.
Efficiency improvements in energy conversion processes are possible through technological advancements, but they cannot overcome the fundamental limitations set by the laws of thermodynamics. Generating more energy than is consumed is not achievable within the framework of our current understanding of physics.