# Shared Flashcard Set

## Details

IGCSE Physics Energy
IGCSE Physics Energy
24
Physics
06/15/2011

Term
 Forms of Energy (nine of them in IGCSE
Definition
 Kinetic, Gravitational PE, Elastic PE, Thermal (heat), Light, Electrical, Sound, Kinetic, Chemical, Nuclear
Term
 Conservation of Energy
Definition
 Energy is never created not destroyed, it just transfers from one form to another
Term
 Energy Transfer
Definition
 When energy converts from on form to another
Term
 Efficiency
Definition
 The fraction of useful work a machine does
Term
 Efficiency formula
Definition
 Efficiency = Useful energy output/ total energy input
Term
 Sankey diagrams
Definition
 Energy flow diagram showing transfers in a system and its environment
Term
 Thermal energy transfer
Definition
Term
 Conduction
Definition
 Occurs chiefly in solids, by interaction between particles which transfers thermal energy
Term
 Convection
Definition
 Occurs in fluids. Warm fluid expands and is replaced by denser cooler fluid which sinks
Term
Definition
 Does not require a medium. Energy is transferred by electromagnetic radiation travelling at the speed of light
Term
 Thermal insulation
Definition
 Materials which slow down the transfer of thermal energy
Term
 Work done
Definition
 A measure of energy transfer (in joules)
Term
 Work formula
Definition
 Work done = Force * distance travelled in direction of the forceW=Fd
Term
 Joule
Definition
 Unit of energy and work. 1 J = 1Nm
Term
 Gravitational potential energy
Definition
 Energy an object has due to its position in a gravitational field
Term
 Gravitational PE formula
Definition
 GPE = mass * g * heightGPE = mgh
Term
 Elastic Potential Energy
Definition
 Energy which an elastic object has when it is stretched or squashed
Term
 Kinetic Energy
Definition
 Energy which an object has due to its motion
Term
 Kinetic energy formula
Definition
 KE = ½ * mass * speed2 KE = ½mv2
Term
 Power
Definition
 The rate of doing workorthe rate of transferring energy from one form to another
Term
 Power formula
Definition
 Power = Work done/ time taken
Term
 Watt
Definition
 The unit or power1W = 1J/s
Term
 Renewable resources
Definition
 These cannot be exhausted and are usually non-polluting eg solar, wind, wave, tidal, HEP, geothermal, biomass
Term
 Non-renewable resources
Definition
 Once used up, these cannot be replaced eg oil, gas, coal, nuclear fuel
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