Why length, mass and time are chosen as base quantities in mechanics ?
Because,
$(i)$ Length, mass and time cannot be derived from any other quantities.
$(ii)$ All other quantities in mechanics can be derived in terms of length, mass and time.
Number of base $SI$ units is
$Kilowatt - hour$ is a unit of
The $SI$ unit of the inductance, the henry cannot be written as
Unit of energy in $SI$ system is
Unit of magnetic moment is