Basics of Energy Flashcards
What is Energy?
the capacity to do work
How is energy measured?
In calories
What is kinetic energy?
energy in motion (throw ball upward, kinetic energy of his throw)
What is potential energy
stored energy. (top of the throw, ran out of kinetic energy. Kenetic energy will pull it back down.)
What is the Law of Conservation?
the law of conservation of energy says that energy changes form but is not created or destroyed.
What are some Renewable energy sources (sources useful to human beings?)
-solar (panels, tubes of fluid heat up causes pressure, can spin a blade or generator, generator produces electricty)
-wind (mills, blade turned by wind)
-hydroelectric (water spins turbine)
-nuclear (fusion reaction, water to heat up)
BASICALLY these all spin generators
Nonrenewable Energy sources
oil, coal, and natural gas
-all come from BIOMASS. Things that used to be plants and animals. Buried and compressed. They turn into oil and we can make fuel out of it. Eventually they can be recreated, but not in a human lifetime, millions of years. If that ground has alot of carbon, we can get coal. but dirty and polluted.
What is bio-mass?
Things that used to be plants and animals. Buried and compressed.
What is the biggest source of pollution?
Coal
What is a natural resource?
anything that is found in nature that is useful to humans. Ex: water, timber, and minerals, as well as the previously discussed energy sources.
What is Albert Einstein’s Theory of Relativity?
states that space and time are relative, not absolute, concepts (so things that move super duper fast, the rules start to break down and not apply.)
What is Quantum theory?
states that matter and energy have properties of both particles and waves.
What is electromagnetism?
Electricity and Magnetism are put together to create this of energy. Each can be used to create the other. We pass electricity through metal, it builds a charge, how we create magnets
What are the steps in using electricity to generate and be used to power a light bulb?
- something spins the generator
- spinning causes a CHARGE with electrons and they want to come out
- We give them a conductor to travel through (powerline like a wire)
- go into the lightbulb. inside the lightbulb there is a FILAMENT that gives more resistance. They really have to push there way through FRICTION
- eventually, the metal glows and it creates the light in the lightbulb. (two power lines= hot line and neutral line)
What is Electrolysis?
is a method of separating ions within a substance by passing electrical current through a substance. (another great way to conduct electricity, Opposites attract.
