Standing wave ratio from ratio of average power to incident power
=================================================================

Knowing the average power delivered to the load and the incident power, it is possible
to calculate the standing wave ratio.

..
    TODO: find link

.. py:currentmodule:: symplyphysics.laws.electricity.circuits.transmission_lines.ratio_of_average_power_to_incident_power_from_standing_wave_coefficient

.. py:data:: standing_wave_ratio

    :attr:`~symplyphysics.symbols.electrodynamics.standing_wave_ratio`.

Symbol:
    :code:`SWR`

Latex:
    :math:`\text{SWR}`

Dimension:
    :code:`dimensionless`


.. py:data:: incident_power

    Incident :attr:`~symplyphysics.symbols.basic.power`.

Symbol:
    :code:`P_incident`

Latex:
    :math:`P_\text{incident}`

Dimension:
    :code:`power`


.. py:data:: average_power

    Average :attr:`~symplyphysics.symbols.basic.power` delivered to the load.

Symbol:
    :code:`avg(P)`

Latex:
    :math:`\langle P \rangle`

Dimension:
    :code:`power`


.. py:data:: law

    :code:`avg(P) / P_incident = 4 * SWR / (SWR + 1)^2`


    Latex:
        .. math::
            \frac{\langle P \rangle}{P_\text{incident}} = \frac{4 \text{SWR}}{\left(\text{SWR} + 1\right)^{2}}