ARRL Technician Practice Exam

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Prepare for the ARRL Technician Exam. Study with flashcards and multiple choice questions, each question has hints and explanations. Get ready for your exam!

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What is the basic unit of inductance?

Volt
Hertz
Ampere
The henry

The correct answer is: The henry

The basic unit of inductance is the henry, which is a measure of how much voltage is induced in a coil when the current flowing through it changes. One henry is defined as the amount of inductance needed to induce one volt of electromotive force when the current changes at a rate of one ampere per second. This fundamental unit is critical in the study of electromagnetism and electrical systems, as it describes the relationship between current and voltage in inductors, which are key components in many circuits. The other choices represent different electrical parameters: a volt measures electric potential, a hertz measures frequency, and an ampere measures electric current. While all of these units are essential in the field of electronics and electrical engineering, they pertain to different aspects of electrical phenomena and do not describe the property of inductance. Hence, the henry is the only correct answer that specifically defines the unit of inductance.