Energy Flashcards
Definition of kinetic energy
Anything that moves
Definition of thermal energy
Objects that are hot/have heat
Definition of chemical energy
Anything that releases energy through a chemical reaction
Definition of gravitational potential energy
Anything with mass in a gravitational field
Definition of elastic potential energy
Anything stretched or compressed
Definition of electrostatic energy
Anything with 2 electrical charges interacting
Definition of magnetic energy
Anything with 2 magnets interacting
Definition of nuclear energy
Energy released through nuclear reactions, stored in atomic nuclei
Law of conservation of energy
Energy cannot be created or destroyed
Definition of Conduction
Thermal energy transfer between solids
Definition of convection
Thermal energy transfer between fluids
Definition of thermal conductivity
How quickly energy is transferred through a material
Renewable energy types
Solar
Hydroelectric
Wind
Tidal
Biofuel
Non renewable energy types
Fossil fuel
Oil
Natural gas
Coal
Why are no devices 100% efficient
Some energy is always wasted, usually through thermal energy transfer
Equation for efficiency
Efficiency = useful energy output (divided by) total energy output
X 100
(Power can be substituted for energy)
4 ways to insulate
Double-glazed windows (trapped air prevents conduction)
Cavity wall insulation
Fitting carpets, curtains, draught excluders
Stone walls
Equation for kinetic energy
Ek=1/2mv(2)
Ek - kinetic energy (J)
m - mass (kg)
v - velocity/speed (m/s)
Equation for elastic potential energy
Ee = 1/2 ke(2)
Ee - elastic potential energy (J)
k - spring constant (N/m)
e - extension (m)
Equation for gravitational potential energy
Ep = mgh
Ep - gravitational potential energy (J)
m - mass (kg)
g - gravitational field strength ( N/kg)
h - height (m)
Equation for specific heat capacity
AE = mcAO
AE - change in energy (J)
m - mass (Kg)
c - specific heat capacity (J/Kg’C)
AO - change in temperature (‘C)
