Quantity measured |
Formula |

Power |
Power = force x velocity |

Power |
Power = VI = V^{2}/R = I^{2}R |

Pressure |
Pressure = Force/Area |

Refractive index |
Refractive index (n) = sin i/sin r = c_{i}/c_{r} |

Resistivity |
Resistivity (r) = RA/L |

Resistors in parallel |
1/R = 1/R_{1} + 1/R_{2} |

Resistors in series |
R = R_{1} + R_{2} |

Speed (velocity) |
Distance/time |

Strain |
Strain = Extension/original length |

Stress |
Stress (s) = F/A |

Torque (moment of a couple) |
Torque = Force x distance between the forces |

Uniformly accelerated motion |
s = ut + at^{2} v^{2} = u^{2} + 2as |

Wave speed |
Wave speed = frequency x wavelength |

Weight |
Weight = mg |

Work done |
Work done = Fscosq |

Young modulus |
E = stress/strain = FL/eA |