units = [A, V, ohm, S, F, H, C, T, Wb] all_units = [] # type: List[Quantity] for u in units: all_units.extend(prefix_unit(u, PREFIXES)) all_units.extend([Z0]) dimsys_MKSA = dimsys_length_weight_time.extend( [ # Dimensional dependencies for base dimensions (MKSA not in MKS) current, ], new_dim_deps=dict( # Dimensional dependencies for derived dimensions voltage=dict(mass=1, length=2, current=-1, time=-3), impedance=dict(mass=1, length=2, current=-2, time=-3), conductance=dict(mass=-1, length=-2, current=2, time=3), capacitance=dict(mass=-1, length=-2, current=2, time=4), inductance=dict(mass=1, length=2, current=-2, time=-2), charge=dict(current=1, time=1), magnetic_density=dict(mass=1, current=-1, time=-2), magnetic_flux=dict(length=2, mass=1, current=-1, time=-2), )) MKSA = MKS.extend(base=(A, ), units=all_units, name='MKSA', dimension_system=dimsys_MKSA)
""" MKS unit system. MKS stands for "meter, kilogram, second, ampere". """ from __future__ import division from sympy.physics.units.definitions import Z0, A, C, F, H, S, T, V, Wb, ohm from sympy.physics.units.dimensions import ( capacitance, charge, conductance, current, impedance, inductance, magnetic_density, magnetic_flux, voltage) from sympy.physics.units.prefixes import PREFIXES, prefix_unit from sympy.physics.units.systems.mks import MKS, _mks_dim dims = (voltage, impedance, conductance, capacitance, inductance, charge, magnetic_density, magnetic_flux) # dimension system _mksa_dim = _mks_dim.extend(base=(current,), dims=dims, name='MKSA') units = [A, V, ohm, S, F, H, C, T, Wb] all_units = [] for u in units: all_units.extend(prefix_unit(u, PREFIXES)) all_units.extend([Z0]) MKSA = MKS.extend(base=(A,), units=all_units, name='MKSA')
all_units.extend(units) all_units.append(Z0) dimsys_MKSA = dimsys_length_weight_time.extend([ # Dimensional dependencies for base dimensions (MKSA not in MKS) current, ], new_dim_deps=dict( # Dimensional dependencies for derived dimensions voltage=dict(mass=1, length=2, current=-1, time=-3), impedance=dict(mass=1, length=2, current=-2, time=-3), conductance=dict(mass=-1, length=-2, current=2, time=3), capacitance=dict(mass=-1, length=-2, current=2, time=4), inductance=dict(mass=1, length=2, current=-2, time=-2), charge=dict(current=1, time=1), magnetic_density=dict(mass=1, current=-1, time=-2), magnetic_flux=dict(length=2, mass=1, current=-1, time=-2), )) MKSA = MKS.extend(base=(ampere,), units=all_units, name='MKSA', dimension_system=dimsys_MKSA, derived_units={ magnetic_flux: weber, impedance: ohm, current: ampere, voltage: volt, inductance: henry, conductance: siemens, magnetic_density: tesla, charge: coulomb, capacitance: farad, })