# Units

## Units framework

The BIPM manages the International System of Units (SI ) wherein seven base units have been defined, from which all other units can be derived :### Kinetic energy

Quantity | Definition | Unit | Formula | ||
---|---|---|---|---|---|

Velocity | Rate of change of on object's position in function of time. Speed is the scalar absolute value (magnitude) of velocity. |
m/s | |||

Acceleration | Rate of change of the velocity of an object with respect to time. | m/s^{2} |
|||

Force | A force causes an object with mass to accelerate. | newton | N | \( N = kg \space m \space s^{-2} \) | |

Weight | Force acting on the object due to gravity. The Earth's gravitational accelaration (free fall in a vacuum) has a conventional standard value of 9.80665 m/s ^{2}, the effective one however depending on latitude and altitude. |
newton | N | \( W = F_g = m \space g = 9.80665 N \) | |

Energy | Work required to move a force over a distance. | joule | J | \( J = N m = kg \space m^2 \space s^{-2} \) |

### Electricity

Quantity | Definition | Unit | Formula | ||
---|---|---|---|---|---|

Charge | Physical property of matter that causes it to experience a force when placed in an electromagnetic field. Corresponds to the electric mass. | coulomb | C | ||

Current | Stream of charged particles moving through an electrical conductor. It expresses the intensity of the electric flux. | ampere | A | \( A = C \space s^{-1} \) | |

Potential difference | The electric potential energy per unit charge. Pressure of the electric flow or electromotive force. | volt | V | \( V = J \space C^{-1} \) | |

Power | Amount of energy transferred or converted per unit of time. The rate at which electrical work is performed when a current flows across an electrical potential difference. | watt | W | \( W = V \space A = J \space s^{-1} \) | |

Energy | Electrical work performed when a current flows across an electrical potential difference during some elapsed time. | joule | J | \( J = W \space s = C \space V \) |