What is the unit of measurement for impedance (Z)?

• A. Volts
• B. Amperes
• C. Ohms
• D. Hertz

Answer: (C)

Impedance, denoted as Z, is defined as the total opposition that a circuit presents to the flow of alternating current (AC). It encompasses both the resistance (the opposition to current flow) and reactance (the opposition to changes in current or voltage due to capacitors and inductors).

The unit of measurement for impedance is the ohm (Ω), which is also the unit of measurement for resistance. This relationship is fundamental in electrical engineering and physics, particularly in alternating current circuits, where impedance plays a crucial role in determining how much current will flow for a given voltage applied across a circuit.

Other units listed, such as volts, amperes, and hertz, serve different purposes: volts measure electrical potential, amperes measure current, and hertz measures frequency. Understanding the distinction among these units is essential for grasping the concepts within electrical science, particularly in AC analysis where impedance is frequently utilized.