**Fundamentals (Circuits)** =========================== .. py:currentmodule:: symplyphysics.electromagnetism.circuits.fundamentals **Contents:** .. toctree:: :maxdepth: 4 electromagnetism.circuits.fundamentals.current_is_charge_derivative electromagnetism.circuits.fundamentals.sum_of_currents_through_junction_is_zero electromagnetism.circuits.fundamentals.sum_of_voltages_in_loop_is_zero