Claims to produce more energy than it consumes, violating the First Law of Thermodynamics (Conservation of Energy).
A perpetual-motion machine is a hypothetical device that, once started, continues to operate indefinitely without any additional energy input. In reality, these machines are impossible because they violate the fundamental . Classification of "Perpetual" Machines Looking Inside the Perpetual-Motion Machine
Attempts to convert thermal energy into work with 100% efficiency without a "cold reservoir," violating the Second Law of Thermodynamics (Entropy). Claims to produce more energy than it consumes,
When you look inside a machine that appears to work, you will always find a hidden energy source or a "trick". Perpetual Motion Machine - First, Second, Third Kind Looking Inside the Perpetual-Motion Machine
To "look inside" these machines, scientists categorize them by which physical law they attempt to break: