Power factor is real power over apparent power
==============================================

Power factor of an AC circuit is a dimensionless physical quantity expressing the circuit's
efficiency. It is the ratio of real power to apparent power of the circuit.

**Links:**

#. `Wikipedia <https://en.wikipedia.org/wiki/Power_factor#Power_triangle>`__.

..
    TODO Move law to circuits folder?

.. py:currentmodule:: symplyphysics.laws.electricity.power_factor_is_real_power_over_apparent_power

.. py:data:: apparent_power

    Apparent :attr:`~symplyphysics.symbols.basic.power` of the circuit, which is the absolute value of the complex
    power.

Symbol:
    :code:`S`

Latex:
    :math:`S`

Dimension:
    :code:`power`


.. py:data:: real_power

    Real :attr:`~symplyphysics.symbols.basic.power`, or active power, of the circuit.

Symbol:
    :code:`P`

Latex:
    :math:`P`

Dimension:
    :code:`power`


.. py:data:: power_factor

    :attr:`~symplyphysics.symbols.electrodynamics.power_factor` of the circuit.

Symbol:
    :code:`pf`

Latex:
    :math:`\mathrm{pf}`

Dimension:
    :code:`dimensionless`


.. py:data:: law

    :code:`pf = P / S`


    Latex:
        .. math::
            \mathrm{pf} = \frac{P}{S}