Energy pg 125-145
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What is renewable energy?
Renewable energy is energy that comes from resources which are naturally replenished on a human time scale.
Give 4 examples of renewable energy sources:
• sunlight (solar) • wind • rain • geothermal heat • tides • waves
Define non-renewable energy:
Energy that will eventually be used up.
Give 3 examples of non-renewable energy sources:
• coal • oil • gas
Why should we use renewable energy sources rather than non-renewable sources?
• save non-renewable energy sources • renewable energy sources are better for the environment • helps slow down global warming
Water (renewable/non-renewable)
Renewable
Solar (renewable/non-renewable)
Renewable
Nuclear (renewable/non-renewable)
Non-renewable
Fossil fuels (renewable/non-renewable)
Non-renewable
What are the different types of energy?
• potential energy * kinetic energy
What are the kinds of potential energy?
# elastic potential energy # chemical potential energy # Gravitational potential energy
What is energy?
The ability for a system to do work
What is the kinetic energy formula?
KE = 1/2 m.v squared M=mass V=speed/velocity NB: Only square the velocity- it’s not mass x velocity, then the answer squared, it’s mass x (v^2)
What is a energy system?
An energy system is a system that transfers energy, a group of parts that work together.
What unit is energy measured in?
Joules
What is a mechanical system?
A mechanical system uses forces and movement to do a specific task. We can use machines and tools to do work for us.
What is a thermal system?
Thermal energy is energy produced by heat. Energy is transferred between the different parts of a thermal system.
What is temperature?
How hot or cold an object is.
What happens to the particles of a substance when heated?
When a substance is heated, the particles move faster and faster. The movement causes the temperature of the substance to rise.
What is a electrical system?
If a battery is connected to a closed circuit, electric currents will flow. The battery stores chemical potential energy. Chemical reactions inside the battery supply charges that can move through electrical wires.
What is electrical current?
Electric current is the movement of charges through electric wires.
What is a biological system?
All living organisms require energy for their vital processes, such as respiration and digestion. Biological energy originates from the sun and its stored in animals and plants in the form of chemical energy.
How is the energy from the sun converted to chemical energy by plants?
Photosynthesis
What is kinetic energy?
Energy that an object has because it is moving.