Equations Flashcards
work done
work done = force x distance
kinetic energy
kinetic energy = 1/2 x mass x velocity ^2
elastic potential energy
1/2 x spring constant x extension^2
what is efficiency
efficiency = useful energy / input energy
power
energy / time
gravitational potential energy
mass x gravitational field strength x height
what is the extension measured in
metres
specific heat capacity
energy = mass x change in temperature x specific heat capacity
payback time (years)
cost to install/ savings each year
charge equation
current x time
what is charge measured in
C
what is current measured in
A
what is time measured in
seconds
voltage/ pd
voltage = work done/ charge
what is the ohms law equation
potential difference = current x resistance
what is potential difference measured in
volts
what is resistance measured in
ohms
electrical power equation
power = potential difference x current
what is the power equation by current and resistance
power = (current)^2 x resistance
energy in a circuit
energy = charge x potential difference
density
density = mass / volume
what can density be measured in
kg/ m^3
g/ cm^3
latent heat
energy = mass x specific latent hear
what is latent heat measured in
J/kg
