Ham Radio Technician Practice Exam 2025 – Comprehensive Prep Resource

Question: 1 / 470

Which letter is used to represent reactance?

R

P

X

Reactance is a measure of the opposition that an inductive or capacitive component presents to the flow of alternating current (AC) due to the stored energy in the electric and magnetic fields. In electrical engineering, reactance is specifically represented by the letter "X."

This notation helps differentiate reactance from resistance, which is indicated by the letter "R." Reactance can be further categorized into capacitive reactance, represented by a negative sign associated with the reactance value in calculations, and inductive reactance, represented by a positive sign. Understanding the concept of reactance is essential for analyzing AC circuits and their behavior with regard to frequency, which is crucial knowledge for amateur radio operators and technicians.

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