Which device stores energy in electromagnetic fields and has the unit Henry?

Which device stores energy in electromagnetic fields and has the unit Henry?

• A. Capacitor
• B. Resistor
• C. Inductor
• D. Diode

Answer: (C)

An inductor stores energy in its magnetic field when current flows through it. The energy held is E = 1/2 L I^2, with L representing inductance. The unit of inductance is the Henry, defined as one weber per ampere, which describes how much magnetic flux linkage is produced per ampere of current. This magnetic energy storage sets inductors apart from capacitors, which store energy in an electric field and use the Farad as the unit; resistors, which dissipate energy as heat; and diodes, which control current without storing energy.

An inductor stores energy in its magnetic field when current flows through it. The energy held is E = 1/2 L I^2, with L representing inductance. The unit of inductance is the Henry, defined as one weber per ampere, which describes how much magnetic flux linkage is produced per ampere of current. This magnetic energy storage sets inductors apart from capacitors, which store energy in an electric field and use the Farad as the unit; resistors, which dissipate energy as heat; and diodes, which control current without storing energy.