A true perpetual motion machine, one that operates forever without an external energy source, is impossible due to the First and Second Laws of Thermodynamics.
1. Harnessing Ambient Energy
Some of the most intriguing "perpetual" devices get their energy from their environment. They operate on very small amounts of energy that are almost imperceptible.
Atmospheric Clocks (like the Atmos Clock): These clocks are wound by minute changes in air temperature and atmospheric pressure.
A bellows inside the clock expands and contracts, providing just enough energy to power the clock's movement for decades. Solar-Powered Devices: While obviously not a perpetual source, devices that run on solar power can seem to operate forever as long as they are in the sun. This is an example of an external energy source that is not "used up" in the traditional sense on a human timescale.
Radiometers: A Crookes radiometer spins when exposed to light. It doesn't run on "light pressure" but rather on small temperature differences created by light hitting the different sides of the vanes inside a partial vacuum.
2. Eliminating Friction (The Third Kind)
Another approach focuses on trying to eliminate the friction that causes machines to stop.
Superconductors: When certain materials are cooled to very low temperatures, their electrical resistance vanishes.
An electric current can then flow through a superconducting loop for years without any energy loss. This doesn't produce useful work, as it's a closed system, but it is a form of perpetual motion in a highly controlled environment. Motion in a Vacuum: In the vacuum of space, a spinning object will continue to spin indefinitely due to a lack of air resistance and friction. This isn't a "machine" in the traditional sense, but it does demonstrate that if you remove the forces that cause energy loss, motion can be maintained.
3. Exploiting "Unconventional" Energy Sources
Some ideas propose using other long-lasting energy sources. While they're not truly perpetual, they could last for thousands of years.
Radioisotope Thermoelectric Generators (RTGs): Used in spacecraft like the Voyagers, these devices convert the heat from the radioactive decay of a material (like Plutonium-238) directly into electricity. The half-life of Plutonium-238 is over 87 years, so these devices can power a spacecraft for many decades.
While none of these are true perpetual motion machines, they represent the closest we can get to the concept by cleverly harnessing available energy or minimizing losses. The real mad science is in perfecting these incredibly efficient systems.
what's the battey, what's the catch?
what are the laws of physics preventing perpetual motion?
The laws of physics preventing perpetual motion are the First and Second Laws of Thermodynamics.
First Law of Thermodynamics
This law is also known as the law of conservation of energy.
Second Law of Thermodynamics
This law is about the quality and direction of energy flow. It states that with every energy conversion, some energy is lost as unusable heat, increasing the total entropy (disorder) of the system.
The laws of physics preventing perpetual motion are the First and Second Laws of Thermodynamics.
First Law of Thermodynamics
This law is also known as the law of conservation of energy.
Second Law of Thermodynamics
This law is about the quality and direction of energy flow. It states that with every energy conversion, some energy is lost as unusable heat, increasing the total entropy (disorder) of the system.
no I mean in terms of power and energy, are what are the physics behind solar?
The physics behind solar power is the photoelectric effect, which is the phenomenon that makes solar panels work.
The Photoelectric Effect ☀️
When sunlight, which is made up of particles called photons, hits the surface of a solar panel, the photons transfer their energy to electrons in the material of the panel. These materials are typically made of semiconductors, such as silicon.
If a photon has enough energy, it can knock an electron loose from its atom.
The Role of Thermodynamics ⚛️
The process of converting sunlight into electricity is also governed by the First and Second Laws of Thermodynamics, which we discussed earlier:
First Law (Conservation of Energy): This law explains that the solar panel doesn't create energy; it simply converts the energy from the photons into electrical energy.
Second Law (Entropy): This is why solar panels are not 100% efficient. When a photon hits the panel, some of its energy is not converted into electricity but is instead lost as heat. This is an unavoidable part of the conversion process and is why solar panels get warm in the sun.
In summary, the photoelectric effect describes the specific mechanism of how solar cells capture light, while the laws of thermodynamics dictate the efficiency and energy conservation of the process.
ok say I hook a battery up to a solar panel and then power a generator would that be perpetual, until the sun dies, and would it create more power than what it takes in?