Energy Flashcards
What is work?
A transfer of energy from one form to another.
What is power?
The rate of energy transfer/
What is kinetic energy?
Energy associated with movement.
What is potential energy?
Stored energy that could produce movement, if transferred.
What is the unit for energy?
Joule (J)
What is the unit for power?
Watt (W)
What is the unit for mass?
Kilogram (kg)
What is unit for time?
Second (s)
What is the energy transfer in a plant?
Light -> Chemical
What is the energy transfer in a car moving up a hill at constant speed?
Chemical -> Kinetic
What is the energy transfer of a car rolling down a hill?
Gpe -> Kinetic
What are three marking points for a Sankey diagram?
Arrows that show input and output energies.
Correct labelling of arrows.
Correct relative size of arrows.
What is the equation for power?
Power = Work Done / Time
What does P stand for?
Power
What does t stand for?
time
What does W stand for?
Work done
Which fuels are fossil fuels?
Oil, Gas, Coal
What are the advantages of fossil fuels?
High energy density, Reliable energy source that is independent of weather conditions
What are the advantages of renewable energy sources, like solar and wind?
Do not release greenhouse gases, so do not contribute to global warming.
Are renewable.
What is the energy transfer in an accelerating car?
Chemical to kinetic
What is the energy transfer in a solar panel?
Light to electrical
What are the disadvantages of fossil fuels?
Release greenhouse gases, contributing to global warming.
Not renewable; will eventually run out.
What are the disadvantages of renewable energy sources, like solar and wind?
Not reliable (vary with weather and time of day)
Usually need to be built in a specific location.
What are the advantages of nuclear power?
Very high energy density.
Do not release greenhouse gases and contribute to global warming.
What are the disadvantages of nuclear power?
Produces radioactive waste with a long half life.
High decommissioning costs.
