Current is voltage over resistance ================================== Current flowing through a conductor is proportional to voltage applied to it and inversely proportional to its resistance. This is also known as the **Ohm's law**. **Notes:** #. This is a phenomenological equation. **Conditions:** #. The material must be ohmic, i.e. current must be proportional to voltage. **Links:** #. `Wikipedia `__. .. py:currentmodule:: symplyphysics.electromagnetism.circuits.direct_current.current_is_voltage_over_resistance .. py:data:: current :attr:`~symplyphysics.symbols.electrodynamics.current` flowing through the conductor. Symbol: :code:`I` Latex: :math:`I` Dimension: :code:`current` .. py:data:: voltage :attr:`~symplyphysics.symbols.electrodynamics.voltage` applied to the conductor. Symbol: :code:`V` Latex: :math:`V` Dimension: :code:`voltage` .. py:data:: resistance :attr:`~symplyphysics.symbols.electrodynamics.electrical_resistance` of the conductor. Symbol: :code:`R` Latex: :math:`R` Dimension: :code:`impedance` .. py:data:: law :code:`I = V / R` Latex: .. math:: I = \frac{V}{R}