Magnetism

whenever a current flows it generates a magnetic field

The use of magnetism for inductors, chokes, transformers, coils, motors, generators, sensors , solenoids, electromagnets, resonator circuits etc

Magnetic field strength

measured in Henrys(H) the unit of electrical inductance. - magnetic field strength H, measured in amperes per meter (A/m)

Most inductors used in electronics are made of a coil of wire wound around an ferromagnetic material

Example of a 10 milliHenry (mH) inductor

Tesla(T) - unit of the magnetic induction (also, magnetic flux density) - magnetic flux density B, measured in Newton-meters per ampere (Nm/A)

Engineering magnetics -- practical introduction to BH curve