Physics Yr 9 energy Flashcards
what does power mean?
the rate of energy transfer or work done
what does efficiency mean?
the ratio of useful energy output to input
What does Specific heat capacity mean?
energy needed to raise temperature of 1kg
what does renewable energy mean?
energy from sources that naturally replenish
what are energy stores?
ways energy is held before being transferred (e.g. kinetic, chemical energy)
What are energy pathways?
describe how energy is transferred between stores (e.g. by heating, electrically)
What are renewable energy sources?
solar, wind, hydroelectric, biomass, and geothermal
What are non renewable energy resources?
coal, oil, natural gas, and nuclear.
Define greenhouse gases?
A greenhouse gas absorbs and emits infrared radiation
Define global warming?
the long-term increase in Earth’s average temperature
What is conduction?
the transfer of heat through a solid material
what is convection?
the transfer of heat in fluids by the movement of particles
define work done?
energy transferred when a force moves something
What are the four pathways?
mechanically
electrically
heating
radiation
What is the formula for efficency?
energy output
over
energy input
