What unit is used to measure impedance in electrical circuits?

Impedance in electrical circuits is measured in ohms. This unit reflects the opposition that a circuit presents to the flow of alternating current (AC) at a particular frequency and encompasses not only resistance, which opposes current flow in DC circuits, but also reactance, which accounts for the effects of inductance and capacitance in AC circuits.

Impedance can be complex, comprising both real and imaginary components, but the overall measurement is expressed in ohms. This is crucial for calculating how circuits will behave under AC conditions, ensuring that systems are designed and analyzed appropriately for performance and safety.

In contrast, the other units listed serve different purposes in electrical measurements: henrys are used for inductance, farads for capacitance, and microfarads are a subunit of farads used to express smaller capacitance values. Each of these is essential for specific applications in circuit design but does not measure impedance directly.