current through the primary coil induces current in the secondary coil.
Examples of primary coil
primary coil
But electric toothbrushes transfer power only from the primary coil to the secondary one at very close range.
From the sfgate.com
The primary coil is connected to the energy source, which then creates a magnetic field that excites electric current in a second coil in the LE Concept.
From the washingtonpost.com
Passive PFC is a simple way of increasing the power factor by putting a coil in series with the primary filter capacitors.