Equations Flashcards
Kinetic energy
kinetic energy = 0.5 × mass × (speed)2
Elastic potential energy
elastic potential energy = 0.5 × spring constant × (extension)2
Gravitational potential energy
gravitational potential energy = mass × gravitational field strength × height
Change in thermal energy
change in thermal energy = mass × specific heat capacity × temperature change
Power (energy transferred)
power = energy transferred/time
Power (work done)
power= work done/time
Efficiency (useful output energy transfer)
efficiency = useful output energy transfer / total input energy transfer
Efficiency (useful power output)
efficiency= useful power output/total power input
Charge flow
charge flow = current × time
Potential difference
potential difference = current × resistance
Power
power = potential difference × current
Power
power = (current)^2 × resistance
Energy transferred
energy transferred = power × time
Energy transferred (charge flow)
energy transferred = charge flow × potential difference
Thermal energy for a change of state
transferred = charge flow × potential difference
density
density= mass / volume
Thermal energy for a change of state
Thermal energy for a change of state= mass x specific latent heat
For gases: pressure
pressure x volume = constant
weight
Mass x gravitational field strength
Work done
Work done= force x distance (along the line of action of the force)
