Energy Flashcards
what are the eight main energy stores
chemical
kinetic
Gravitational potential
elastic
thermal
magnetic
electrostatic
nuclear
what is a closed system
where the total energy will always be the same
what are 4 ways energy is transferred
mechanically
electrically
thermally
radiation
how is energy transferred mechanically
by a force move across a distance
how is energy transferred electrically
by the use of electrical currents
how does radiation transfer energy
by waves such as electromagnetic or sound
what is the efficiency of a device
how much useful energy it transfers
what 3 factors affect the rate at which thermal energy is transferred between the wall of a house
- the temperature difference
- the thickness of the wall
- material of the wall
what are 5 renewable energy sources
- Biofuels
- Hydroelectricity
- Wind turbines
- Tidal Power
- Solar cells
how do solar cells work
they convert solar energy directly to electricity
how do biofuels work
animal or plant matter is burned to produce thermal energy
how does hydroelectricity work
generated electricity from the water behind a dam flowing down tubes and turning a turbine
how do wind turbines work
use the kinetic energy from the wind to turn a turbine
how does tidal power work
uses the rise and fall of the tide to turn a turbine and generate electricity
what is a renewable energy resource
that will not run out
