energy can be transformed....it cannot be destroyed
(grade school science class)
You are correct to a point...
What you've seemed to left out, is the part that energy has to come from some sorts of MATTERS or PARTICLES.
And matters and most particles have MASSES, which can produce the energy.
The energy don't come from nowhere. This is why modern science view mass and energy.
For instance, the (human) body have mass. At rest, it has potential energy to the work.
But the human body gain energy from a variety of sources, and not just from the muscles alone.
Some of the examples of different sources that I can think of at the top of my head, even through I am not a biologist:
- The body required energy, like fuel. This fuel we see as food that we eat and digest. These food can have any of the natural energy sources, for instances, fat/oil, proteins and sugars. We not only use to fuel any work done by the body, but to replenish the energy loss through work.
- Boost of energy can come from adrenaline that are secreted from adrenal glands.
- Water can not only hydrated our bodies, but also regulate the body temperature, cooling it, to prevent body from
- Oxygen is one of the other sources of energy. Exercises like from Tai Chi (Taiji) or yoga stressed the importance of breathing, whether the body is moving or at rest (eg meditation), because strength and energy can be gained through breathing in the air.
All of these energies (from different sources) are distributed or circulated throughout the body, by our blood cells.
So food, water, air, adrenaline, etc, are sources of energy that the body derived from. These energies don't just come out of nothing.
The stars, including our sun, produced energy in the forms of light and heat, through fusing lighter elements (like hydrogen) into heavier elements (like helium).
All the electrical devices that we take for granted, are powered by electricity, but where do electricity come from. Electricity has to be made. With battery powered device, one of the most basic is using chemical reaction of acid and two different plates. But other sources come from solar power (hence from sunlight), from coal (burning of coals), from turbine-powered machine (from wind or water current). The combination of using electricity and something, eg antenna, to produce electromagnetic fields, would require to transmit or receive signals.
What am I getting at, is that I think most energy, required some sort of physical masses, to produce energy. Energy cannot come from nothing.
