What is the unit of inductance?

• A. The henry
• B. The farad
• C. The watt
• D. The joule

Answer: (A)

The unit of inductance is the henry, which is a fundamental unit in the International System of Units (SI) used to quantify inductance in electrical circuits. Inductance refers to the ability of a coil or inductor to store electrical energy in a magnetic field when an electric current passes through it. Specifically, one henry is defined as the inductance of a circuit in which a change in current of one ampere per second produces an electromotive force (emf) of one volt.

The other units provided refer to different physical quantities. The farad is the unit of capacitance, which measures a capacitor's ability to store electrical charge. The watt is a unit of power, indicating the rate at which work is done or energy is transferred. The joule is a unit of energy, representing the amount of energy transferred when one watt of power is applied for one second. Understanding units is essential for anyone working with electronic and electrical systems, as they provide the foundation for much of the work in these fields.