The main functionality of an electric circuit is to provide a closed conductive path for the flow of electric current driven by an electromotive force (EMF). This allows devices to operate by controlling the flow of electric charges.

The main functionality of a magnetic circuit is to provide a closed loop path for the flow of magnetic flux driven by magnetomotive force (MMF). This allows the generation and control of magnetic fields essential for the operation of electromagnetic devices.

Common examples of electric circuits include household wiring circuits, electronic circuits on printed circuit boards, automobile circuits, industrial control circuits, and power distribution circuits.

Common examples of magnetic circuits include the core of a transformer, the stator and rotor cores of electric motors and generators, magnetic components in electronics like relays, magnetic recording heads, and magnetic braking systems.

Electric current flows through an electric circuit, not voltage. Voltage is the driving force that pushes current through the conductor in a circuit against the opposition of resistance.