Efficiency of heat engine
=========================

Efficiency of a heat engine is the ratio of the useful energy to the total energy received
by the system.

**Links:**

#. `Wikipedia <https://en.wikipedia.org/wiki/Heat_engine#Efficiency>`__.

.. py:currentmodule:: symplyphysics.laws.thermodynamics.efficiency_of_heat_engine

.. py:data:: heat_from_heater

    :attr:`~symplyphysics.symbols.thermodynamics.heat` transferred by the heater to the heat engine.

Symbol:
    :code:`Q_h`

Latex:
    :math:`Q_{h}`

Dimension:
    :code:`energy`


.. py:data:: heat_to_refrigerator

    :attr:`~symplyphysics.symbols.thermodynamics.heat` transferred by the heat engine to the refrigerator.

Symbol:
    :code:`Q_r`

Latex:
    :math:`Q_{r}`

Dimension:
    :code:`energy`


.. py:data:: efficiency

    :attr:`~symplyphysics.symbols.thermodynamics.thermal_efficiency` of the heat engine.

Symbol:
    :code:`eta`

Latex:
    :math:`\eta`

Dimension:
    :code:`dimensionless`


.. py:data:: law

    :code:`eta = 1 - Q_r / Q_h`


    Latex:
        .. math::
            \eta = 1 - \frac{Q_{r}}{Q_{h}}