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density (kg/m³)
mass (kg) / volume (m³)
change in thermal energy (J)
mass (kg) x specific heat capacity (J/kg°C) x change in temperature (°C)
thermal energy for change in state (J)
mass (kg) x specific latent heat (J/kg)
Boyle’s law
pressure (Pa) x volume (m³) = constant
pressure due to a column of liquid (Pa)
height of column (m) x density of liquid (kg/m³) x gravitational field strength (N/kg)
suvat
(final velocity (m/s))² - (initial velocity (m/s))² = 2 x acceleration (m/s²) x distance (m)
distance (m)
speed (m/s) x time (s)
acceleration (m/s²)
change in velocity (m/s) / time (s)
kinetic energy (J)
½ x mass (kg) x (velocity (m/s))²
force (N)
mass (kg) x acceleration (m/s²)
momentum (kgm/s)
mass (kg) x velocity (m/s)
work done (J)
force (N) x distance (m) → distance needs to be along the line of action of the force
power (W)
energy (J) / time (s)
work done (J) / time (s)
current (A) x voltage (V)
(current (A))² x resistance (Ohms)
energy transferred in stretching (J)
½ x spring constant (N/m) x (extension (m))²
force exerted by a spring (N)
spring constant (N/m) x extension (m)
weight (N)
mass (kg) x gravitational field strength (N/kg)
gravitational potential energy (J)
mass (kg) x gravitational field strength (N/kg) x height (m)
pressure (Pa)
force normal to the surface (N) / area of the surface (m²)
moment (Nm)
force (N) x distance normal to the direction of the force (m)
charge flow (C)
current (A) x time (s)
potential difference (V)
current (A) x resistance (Ohms)
electrical energy transferred (J)
charge (C) x potential difference (V)
energy transferred (J, kWh)
power (W, kW) x time (s, h)
force on a conductor (at right angles to a magnetic field) carrying a current (N)
magnetic field strength (T) x current (A) x length (m)
transformers
v(primary) / v(secondary = n(primary) / n(secondary)
wave speed (m/s)
frequency (Hz) x wavelength (m)
efficiency
useful output energy transfer / total input energy transfer
P8.2
v(primary) x I(primary) = v(secondary) x I(secondary)
