Energy Flashcards
Energy stores - 8
Kinetic Chemical Thermal gravitational magnetic electrostatic elastic nuclear
Principle of conservation of energy
The amount of energy always remains the same
Insulator
Only allows a slow transfer of energy
Convection currents
Air heated
Less dense
Rise
Cold, denser air fills space
Conduction
Heat is thermal energy. It can be transferred from one place to another by conduction.
Conduction
Heat is thermal energy. It can be transferred from one place to another by conduction.
Radiation
Waves
Electromagnetic energy from sun by radiation
black surfaces are good emitters and absorbers of radiation
shiny surfaces are poor emitters and absorbers of radiation
resources of energy
Non-renewable: fossil fuel - coal gas
Renewable: solar, nuclear, water etc
Work measurement
measured I n joules
Transfers of energy
Mechanical work
Electrical work
Heating
Radiation
Work done =
energy transferred
Work done = mgh
The work done is equal to the increase in potential energy
Work done = mgh
The work done is equal to the increase in potential energy
Power
The rate at which energy is transferred or the rate at which work is done.
Power equation
given in exam
Power = energy transferred / time = work done / time
