What physical property does reactance primarily depend on?

• A. The resistance in a conductor
• B. The capacitance or inductance of a component
• C. The power factor of the electrical system
• D. The frequency of the alternating current

Answer: (B)

Reactance is a specific property of alternating current (AC) circuits that arises from the presence of inductive and capacitive components. It reflects how these components oppose the flow of alternating current due to their ability to store and release energy.

The two types of reactance are inductive reactance, which is directly related to the inductance of a coil and the frequency of the AC signal passing through it, and capacitive reactance, which is related to the capacitance of a capacitor and the frequency of the AC signal as well. As the frequency changes, the reactance will also change, being proportional to the frequency for inductors and inversely proportional for capacitors.

Thus, reactance fundamentally depends on the capacitance or inductance of a component. When calculating reactance, the formulas used incorporate these specific properties, demonstrating their role in determining how much the component will impede the flow of AC. The resistance in a conductor does not directly influence reactance but instead relates to how the current behaves in direct current (DC) circuits. The power factor is a measure of how effectively the current is being converted into useful work, and while it involves reactance, it is not a direct property of reactance itself.