science

posted by .

Where does energy come from?


Energy can come from the complete destruction of matter (as in nuclear reactions), or the rearrangement of electrons or other charged particles inside matter (as in chemical reactions) or from electromagetic fields (as in light and heat radiation), or from the deceleration or pressure drop of moving matter (as in hydroelectric or wind power).

Here on Earth, most of the energy that we use comes from the sun, or from the combustion of fossil fuels that were produced by the light from the sun at an earlier time, or from nuclear reactions involving isotopes like U-235 and deuterium that were present before the Earth and sun were formed.

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Biology

    Which materials produce during the light reactions of photosynthesis are essential to the dark reactions?
  2. Chemistry

    In stoichiometry, chemists are mainly concerned with a. types of bonds found in compounds b. energy changes occuring in chemical reactions c. mass relationships in chemical reactions d. speed with which chemical reactions occur i thought …
  3. Changes in Matter

    Which of the following are examples of a chemical change?
  4. biology

    Which of the following is true about the relationship between energy and chemical reactions?
  5. physics-nuclear reactors

    a) Let's assume a nuclear reactor was a completely isolated system, such that no matter particles can escape from it and the only thing that can get out is energy in the form of heat and radiation. If we weigh the whole reactor before …
  6. chemistry

    Mass is lost or gains in a.) all chemical reactions b.) all nuclear fission reactions c.) all nuclear fusion reactions d.) all chemical and nuclear reactions my guess is B
  7. Science "HELP"!

    Passage:The particles of matter are in constant motion. The energy of motion is called kinetic energy, so the particles of matter have kinetic energy. As matter becomes warmer, its particles move faster. As a result, their kinetic …
  8. Science

    1. Massive amounts of destructive energy are released when a nuclear fission bomb explodes. Where does that energy come from?
  9. science

    how should each form of energy be identified?
  10. Science

    How does a nuclear power plant produce energy?

More Similar Questions